1
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Imperato M, Nicolini A, Boniburini M, Sartini D, Benassi E, Chiesa M, Gigli L, Liao YK, Raza A, Salvadori E, Sorace L, Cornia A. Dual Structure of a Vanadyl-Based Molecular Qubit Containing a Bis(β-diketonato) Ligand. Inorg Chem 2024; 63:7912-7925. [PMID: 38620046 DOI: 10.1021/acs.inorgchem.4c00834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/17/2024]
Abstract
We designed [VO(bdhb)] (1') as a new electronic qubit containing an oxovanadium(IV) ion (S = 1/2) embraced by a single bis(β-diketonato) ligand [H2bdhb = 1,3-bis(3,5-dioxo-1-hexyl)benzene]. The synthesis afforded three different crystal phases, all of which unexpectedly contain dimers with formula [(VO)2(bdhb)2] (1). A trigonal form (1h) with a honeycomb structure and 46% of solvent-accessible voids quantitatively transforms over time into a monoclinic solvatomorph 1m and minor amounts of a triclinic solventless phase (1a). In a static magnetic field, 1h and 1m have detectably slow magnetic relaxation at low temperatures through quantum tunneling and Raman mechanisms. Angle-resolved electron paramagnetic resonance (EPR) spectra on single crystals revealed signatures of low-dimensional magnetic behavior, which is solvatomorph-dependent, being the closest interdimer V···V separations (6.7-7.5 Å) much shorter than intramolecular V···V distances (11.9-12.1 Å). According to 1H diffusion ordered spectroscopy (DOSY) and EPR experiments, the complex adopts the desired monomeric structure in organic solution and its geometry was inferred from density functional theory (DFT) calculations. Spin relaxation measurements in a frozen toluene-d8/CD2Cl2 matrix yielded Tm values reaching 13 μs at 10 K, and coherent spin manipulations were demonstrated by Rabi nutation experiments at 70 K. The neutral quasi-macrocyclic structure, featuring nuclear spin-free donors and additional possibilities for chemical functionalization, makes 1' a new convenient spin-coherent building block in quantum technologies.
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Affiliation(s)
- Manuel Imperato
- Dipartimento di Scienze Chimiche e Geologiche e UdR INSTM, Università degli Studi di Modena e Reggio Emilia, via G. Campi 103, 41125 Modena, Italy
- Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Università degli Studi di Modena e Reggio Emilia, via G. Campi 213/A, 41125 Modena, Italy
| | - Alessio Nicolini
- Dipartimento di Scienze Chimiche e Geologiche e UdR INSTM, Università degli Studi di Modena e Reggio Emilia, via G. Campi 103, 41125 Modena, Italy
| | - Matteo Boniburini
- Dipartimento di Scienze Chimiche e Geologiche e UdR INSTM, Università degli Studi di Modena e Reggio Emilia, via G. Campi 103, 41125 Modena, Italy
| | - Daniele Sartini
- Dipartimento di Chimica "Ugo Schiff" e UdR INSTM, Università degli Studi di Firenze, via della Lastruccia 3, 50019 Sesto Fiorentino (FI), Italy
| | - Enrico Benassi
- Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Università degli Studi di Modena e Reggio Emilia, via G. Campi 213/A, 41125 Modena, Italy
| | - Mario Chiesa
- Dipartimento di Chimica e NIS Centre, Università degli Studi di Torino, via P. Giuria 7, 10125 Torino, Italy
| | - Lara Gigli
- Elettra-Sincrotrone Trieste S.C.p.A., Strada Statale 14 - km 163.5 in AREA Science Park, 34149 Basovizza (TS), Italy
| | - Yu-Kai Liao
- Dipartimento di Chimica e NIS Centre, Università degli Studi di Torino, via P. Giuria 7, 10125 Torino, Italy
| | - Arsen Raza
- Dipartimento di Chimica "Ugo Schiff" e UdR INSTM, Università degli Studi di Firenze, via della Lastruccia 3, 50019 Sesto Fiorentino (FI), Italy
| | - Enrico Salvadori
- Dipartimento di Chimica e NIS Centre, Università degli Studi di Torino, via P. Giuria 7, 10125 Torino, Italy
| | - Lorenzo Sorace
- Dipartimento di Chimica "Ugo Schiff" e UdR INSTM, Università degli Studi di Firenze, via della Lastruccia 3, 50019 Sesto Fiorentino (FI), Italy
| | - Andrea Cornia
- Dipartimento di Scienze Chimiche e Geologiche e UdR INSTM, Università degli Studi di Modena e Reggio Emilia, via G. Campi 103, 41125 Modena, Italy
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Yang M, Cheng G, Mathur N, Singha R, Yuan F, Yao N, Schoop LM. Chemical exfoliation of 1-dimensional antiferromagnetic nanoribbons from a non-van der Waals material. NANOSCALE HORIZONS 2024; 9:479-486. [PMID: 38258388 DOI: 10.1039/d3nh00408b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
As the demand for increasingly varied types of 1-dimensional (1D) materials grows, there is a greater need for new methods to synthesize these types of materials in a simple and scalable way. Chemical exfoliation is commonly used to make 2-dimensional (2D) materials, often in a way that is both straightforward and suitable for making larger quantities, yet this method has thus far been underutilized for synthesizing 1D materials. In the few instances when chemical exfoliation has been used to make 1D materials, the starting compound has been a van der Waals material, thus excluding any structures without these weak bonds inherently present. We demonstrate here that ionically bonded crystals can also be chemically exfoliated to 1D structures by choosing KFeS2 as an example. Using chemical exfoliation, antiferromagnetic 1D nanoribbons can be yielded in a single step. The nanoribbons are crystalline and closely resemble the parent compound both in structure and in intrinsic antiferromagnetism. The facile chemical exfoliation of an ionically bonded crystal shown in this work opens up opportunities for the synthesis of both magnetic and non-magnetic 1D nanomaterials from a greater variety of starting structures.
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Affiliation(s)
- Mulan Yang
- Department of Chemistry, Princeton University, Princeton, NJ 08544, USA.
| | | | - Nitish Mathur
- Department of Chemistry, Princeton University, Princeton, NJ 08544, USA.
| | - Ratnadwip Singha
- Department of Chemistry, Princeton University, Princeton, NJ 08544, USA.
| | - Fang Yuan
- Department of Chemistry, Princeton University, Princeton, NJ 08544, USA.
| | - Nan Yao
- Princeton Materials Institute, Princeton, NJ 08544, USA
| | - Leslie M Schoop
- Department of Chemistry, Princeton University, Princeton, NJ 08544, USA.
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3
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Dmitriev DV, Krivnov VY. Magnetic properties of ferro-antiferromagnetic spin triangle chain. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2024; 36:195801. [PMID: 38306710 DOI: 10.1088/1361-648x/ad258a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Accepted: 02/02/2024] [Indexed: 02/04/2024]
Abstract
Frustrated spin-12model consisting of a linear chain of triangles with ferro (F)- and antiferromagnetic interactions connected by ferromagnetic interactions (triangles chain) is studied. The ground state phase diagram depending on the interaction ratios consists of ferromagnetic, two ferrimagnetic and singlet phases. The magnetic properties in these phases are analyzed both analytically and numerically. We show that in some regions of the singlet phase the magnetization curves have magnetization plateau and magnetization jumps. We study the thermodynamics and its relation to the specific structure of the excitation spectrum of the triangle chain.
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Affiliation(s)
- D V Dmitriev
- Institute of Biochemical Physics of RAS, Kosygin str. 4, 119334 Moscow, Russia
| | - V Ya Krivnov
- Institute of Biochemical Physics of RAS, Kosygin str. 4, 119334 Moscow, Russia
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Lavrenova LG, Sukhikh TS, Glinskaya LA, Trubina SV, Zvereva VV, Lavrov AN, Klyushova LS, Artem’ev AV. Synthesis, Structure, and Magnetic and Biological Properties of Copper(II) Complexes with 1,3,4-Thiadiazole Derivatives. Int J Mol Sci 2023; 24:13024. [PMID: 37629205 PMCID: PMC10455747 DOI: 10.3390/ijms241613024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 07/11/2023] [Accepted: 08/17/2023] [Indexed: 08/27/2023] Open
Abstract
New coordination compounds of copper(II) with 2,5-bis(ethylthio)-1,3,4-thiadiazole (L1) and 2,5-bis(pyridylmethylthio)-1,3,4-thiadiazole (L2) with compositions Cu(L1)2Br2, Cu(L1)(C2N3)2, Cu(L2)Cl2, and Cu(L2)Br2 were prepared. The complexes were identified and studied by CHN analysis, infrared (IR) spectroscopy, powder X-Ray diffraction (XRD), and static magnetic susceptibility. The crystal structures of Cu(II) complexes with L1 were determined. The structures of the coordination core of complexes Cu(L2)Cl2 and Cu(L2)Br2 were determined by Extended X-ray absorption fine structure (EXAFS) spectroscopy. Magnetization measurements have revealed various magnetic states in the studied complexes, ranging from an almost ideal paramagnet in Cu(L1)2Br2 to alternating-exchange antiferromagnetic chains in Cu(L1)(C2N3)2, where double dicyanamide bridges provide an unusually strong exchange interaction (J1/kB ≈ -23.5 K; J2/kB ≈ -20.2 K) between Cu(II) ions. The cytotoxic activity of copper(II) complexes with L2 was estimated on the human cell lines of breast adenocarcinoma (MCF-7) and hepatocellular carcinoma (HepG2).
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Affiliation(s)
- Lyudmila G. Lavrenova
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk 630090, Russia; (T.S.S.); (L.A.G.); (S.V.T.); (V.V.Z.); (A.N.L.); (A.V.A.)
| | - Taisiya S. Sukhikh
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk 630090, Russia; (T.S.S.); (L.A.G.); (S.V.T.); (V.V.Z.); (A.N.L.); (A.V.A.)
| | - Lyudmila A. Glinskaya
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk 630090, Russia; (T.S.S.); (L.A.G.); (S.V.T.); (V.V.Z.); (A.N.L.); (A.V.A.)
| | - Svetlana V. Trubina
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk 630090, Russia; (T.S.S.); (L.A.G.); (S.V.T.); (V.V.Z.); (A.N.L.); (A.V.A.)
| | - Valentina V. Zvereva
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk 630090, Russia; (T.S.S.); (L.A.G.); (S.V.T.); (V.V.Z.); (A.N.L.); (A.V.A.)
| | - Alexander N. Lavrov
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk 630090, Russia; (T.S.S.); (L.A.G.); (S.V.T.); (V.V.Z.); (A.N.L.); (A.V.A.)
| | - Lyubov S. Klyushova
- Institute of Molecular Biology and Biophysics, Federal Research Center for Fundamental and Translational Medicine, Novosibirsk 630117, Russia;
| | - Alexander V. Artem’ev
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk 630090, Russia; (T.S.S.); (L.A.G.); (S.V.T.); (V.V.Z.); (A.N.L.); (A.V.A.)
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5
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Lavrenova LG, Ivanova AI, Glinskaya LA, Artem'ev AV, Lavrov AN, Novikov AS, Abramov PA. Halogen Bonding Channels for Magnetic Exchange in Cu(II) Complexes with 2,5-Di(methylthio)-1,3,4-thiadiazole. Chem Asian J 2023; 18:e202201200. [PMID: 36629842 DOI: 10.1002/asia.202201200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 01/11/2023] [Accepted: 01/11/2023] [Indexed: 01/12/2023]
Abstract
Copper(II) complexes with 2,5-bis(methylthio)-1,3,4-thiadiazole (tda) formulated as [Cu(tda)n X2 ] (n=2, X=Cl- , Br- , C2 N3 - ; n= 1, X=C2 N3 - ) have been isolated and fully characterized. The crystal structures of all compounds have been determined using single-crystal X-ray diffraction (SCXRD). A study of the magnetic susceptibility in the range 1.77-300 K has shown that magnetic properties of the [Cu(tda)2 Cl2 ] and [Cu(tda)2 Br2 ] complexes match those of 1D chains of antiferromagnetically-coupled Cu2+ ions. The intrachain interaction J in [Cu(tda)2 Cl2 ] turns out to be ∼1.2 times weaker than in its bromide analogue. In its turn, [Cu(tda)2 (C2 N3 )2 ] exhibits J being an order of magnitude smaller and of the opposite ferromagnetic sign. Halogen bonding (HB) between adjacent complexes is much stronger than the H-bonds or π-π interactions between tda ligands according to the DFT calculations.
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Affiliation(s)
- Ludmila G Lavrenova
- Nikolaev Institute of Inorganic Chemistry SB RAS, 3 acad. Lavrentiev Ave., 630090, Novosibirsk, Russia
| | - Alina I Ivanova
- Nikolaev Institute of Inorganic Chemistry SB RAS, 3 acad. Lavrentiev Ave., 630090, Novosibirsk, Russia
| | - Lyudmila A Glinskaya
- Nikolaev Institute of Inorganic Chemistry SB RAS, 3 acad. Lavrentiev Ave., 630090, Novosibirsk, Russia
| | - Alexander V Artem'ev
- Nikolaev Institute of Inorganic Chemistry SB RAS, 3 acad. Lavrentiev Ave., 630090, Novosibirsk, Russia
| | - Alexander N Lavrov
- Nikolaev Institute of Inorganic Chemistry SB RAS, 3 acad. Lavrentiev Ave., 630090, Novosibirsk, Russia
| | - Alexander S Novikov
- Institute of Chemistry, Saint Petersburg State University, Universitetskaya Nab., 7/9, 199034, Saint Petersburg, Russia.,Research Institute of Chemistry, Рeoples' Friendship University of Russia (RUDN University), Miklukho-Maklaya St., 6, 117198, Moscow, Russia
| | - Pavel A Abramov
- Nikolaev Institute of Inorganic Chemistry SB RAS, 3 acad. Lavrentiev Ave., 630090, Novosibirsk, Russia.,Institute of Natural Sciences and Mathematics Ural Federal University named after B.N. Yeltsin, Lenin Ave, 51, Yekaterinburg, 620075, Russia
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Li Manni G, Kats D, Liebermann N. Resolution of Electronic States in Heisenberg Cluster Models within the Unitary Group Approach. J Chem Theory Comput 2023; 19:1218-1230. [PMID: 36735906 PMCID: PMC9979614 DOI: 10.1021/acs.jctc.2c01132] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
In this work ground and excited electronic states of Heisenberg cluster models, in the form of configuration interaction many-body wave functions, are characterized within the spin-adapted Graphical Unitary Group Approach framework, and relying on a novel combined unitary and symmetric group approach. Finite-size cluster models of well-defined point-group symmetry and of general local-spin Slocal>12 are presented, including J1-J2 triangular and tetrahedral clusters, which are often used to describe magnetic interactions in biological and biomimetic polynuclear transition metal clusters with unique catalytic activity, such as nitrogen fixation and photosynthesis. We show that a unique block-diagonal structure of the underlying Hamiltonian matrix in the spin-adapted basis emerges when an optimal lattice site ordering is chosen that reflects the internal symmetries of the model investigated. The block-diagonal structure is bound to the commutation relations between cumulative spin operators and the Hamiltonian operator, that in turn depend on the geometry of the cluster investigated. The many-body basis transformation, in the form of the orbital/site reordering, exposes such commutation relations. These commutation relations represent a rigorous and formal demonstration of the block-diagonal structure in Hamiltonian matrices and the compression of the corresponding spin-adapted many-body wave functions. As a direct consequence of the block-diagonal structure of the Hamiltonian matrix, it is possible to selectively optimize electronic excited states without the overhead of calculating the lower-energy states by simply relying on the initial ansatz for the targeted wave function. Additionally, more compact many-body wave functions are obtained. In extreme cases, electronic states are precisely described by a single configuration state function, despite the curse of dimensionality of the corresponding Hilbert space. These findings are crucial in the electronic structure theory framework, for they offer a conceptual route toward wave functions of reduced multireference character, that can be optimized more easily by approximated eigensolvers and are of more facile physical interpretation. They open the way to study larger ab initio and model Hamiltonians of increasingly larger number of correlated electrons, while keeping the computational costs at their lowest. In particular, these elements will expand the potential of electronic structure methods in understanding magnetic interactions in exchange-coupled polynuclear transition metal clusters.
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Ranaut D, Mukherjee K. A plausible investigation of low dimensional magnetism in a 3D spin system PrVO 4. Phys Chem Chem Phys 2023; 25:4305-4312. [PMID: 36688596 DOI: 10.1039/d2cp04449h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
3D spin systems provide an important platform to investigate the novel magnetic behaviors, which arise due to the complex network of spins in such materials. In this context, we have studied a rare-earth orthovanadate PrVO4, in which the distorted PrO8 polyhedral results in complex spin geometries made by the near neighbor Pr atoms. The fourth near neighbor Pr atoms form linear chains, which are separated by non-magnetic VO4 tetrahedra. DC magnetic susceptibility reveals a broad maximum and its position remains unaltered under applied magnetic field. The magnetic heat capacity shows a broad maximum with almost zero value at low temperatures. This indicates the presence of spin gap in the excitation spectra and hints toward the possibility of low dimensional magnetism. Our investigations reveal that PrVO4 can be a potential candidate to study low dimensional magnetism in rare-earth-based systems.
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Affiliation(s)
- Dheeraj Ranaut
- School of Physical Sciences, Indian Institute of Technology Mandi, Mandi, 175075, Himachal Pradesh, India.
| | - K Mukherjee
- School of Physical Sciences, Indian Institute of Technology Mandi, Mandi, 175075, Himachal Pradesh, India.
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Synthesis, Structural, Magnetic and Computational Studies of A One-Dimensional Ferromagnetic Cu(II) Chain Assembled from a New Schiff Base Ligand. CHEMISTRY 2023. [DOI: 10.3390/chemistry5010007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
A new asymmetrically substituted ONOO Schiff base ligand N-(2′-hydroxy-1′-naphthylidene)-3-amino-2-naphthoic acid (nancH2) was prepared from the condensation of 2–hydroxy–1–naphthaldehyde and 3–amino–2–naphthoic acid. nancH2 reacts with Cu2(O2CMe)4·2H2O in the presence of Gd(O2CMe)3·6H2O to afford a uniform one-dimensional homometallic chain, [CuII(nanc)]n (1). The structure of 1 was elucidated via single crystal X-ray diffraction studies, which revealed that the Cu(II) ions adopt distorted square planar geometries and are coordinated in a tridentate manner by an [ONO] donor set from one nanc2− ligand and an O− of a bridging carboxylate group from a second ligand. The bridging carboxylato group of the nanc2− ligand adopts a syn, anti-η1:η1:μ conformation linking neighboring Cu(II) ions, forming a 1D chain. The magnetic susceptibility of 1 follows Curie–Weiss law in the range 45–300 K (C = 0.474(1) emu K mol-1, θ = +7.9(3) K), consistent with ferromagnetic interactions between S = ½ Cu(II) ions with g = 2.248. Subsequently, the data fit well to the 1D quantum Heisenberg ferromagnetic (QHFM) chain model with g = 2.271, and J = +12.3 K. DFT calculations, implementing the broken symmetry approach, were also carried out on a model dimeric unit extracted from the polymeric chain structure. The calculated exchange coupling via the carboxylate bridge (J = +13.8 K) is consistent with the observed ferromagnetic exchange between neighbouring Cu(II) centres.
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Arian Zad H, Zoshki A, Ananikian N, Jaščur M. Tomonaga-Luttinger Spin Liquid and Kosterlitz-Thouless Transition in the Spin-1/2 Branched Chains: The Study of Topological Phase Transition. MATERIALS 2022; 15:ma15124183. [PMID: 35744242 PMCID: PMC9230796 DOI: 10.3390/ma15124183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 06/07/2022] [Accepted: 06/09/2022] [Indexed: 12/03/2022]
Abstract
In the present work, we provide a comprehensive numerical investigation of the magnetic properties and phase spectra of three types of spin-1/2 branched chains consisting of one, two and three side spins per unit block with intra-chain interaction and a uniform inter-chain interaction in the presence of an external magnetic field. In a specific magnetic field interval, the low-temperature magnetization of these chains shows a step-like behavior with a pronounced plateau depending on the strength and the type of intra-chain interaction being ferromagnetic or antiferromagnetic. We demonstrate that when inter-chain interaction J1 is antiferromagnetic and intra-chain interaction J2 is ferromagnetic, the magnetization of the models manifests a smooth increase without a plateau, which is evidence of the existence of a Luttinger-like spin liquid phase before reaching its saturation value. On the other hand, when J1 is ferromagnetic and J2 is antiferromagnetic, the low-temperature magnetization of the chain with two branches shows an intermediate plateau at one-half of the saturation magnetization that breaks a quantum spin liquid phase into two regions. The magnetization of the chain with three branches exhibits two intermediate plateaus and two regions of a quantum spin liquid. We demonstrate that the chains with more than one side spin illustrate in their ground-state phase diagram a Kosterlitz–Thouless transition from a gapful phase to a gapless spin liquid phase.
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Affiliation(s)
- Hamid Arian Zad
- Alikhanyan National Science Laboratory, Alikhanian Br. 2, Yerevan 0036, Armenia;
- Department of Theoretical Physics and Astrophysics, Faculty of Science, P. J. Sǎfárik University, Park Angelinum 9, 041 54 Kosice, Slovakia; (A.Z.); (M.J.)
- Correspondence:
| | - Azam Zoshki
- Department of Theoretical Physics and Astrophysics, Faculty of Science, P. J. Sǎfárik University, Park Angelinum 9, 041 54 Kosice, Slovakia; (A.Z.); (M.J.)
| | - Nerses Ananikian
- Alikhanyan National Science Laboratory, Alikhanian Br. 2, Yerevan 0036, Armenia;
- CANDLE Synchrotron Research Institute, Acharyan 31, Yerevan 0022, Armenia
| | - Michal Jaščur
- Department of Theoretical Physics and Astrophysics, Faculty of Science, P. J. Sǎfárik University, Park Angelinum 9, 041 54 Kosice, Slovakia; (A.Z.); (M.J.)
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10
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Povarov KY, Soldatov TA, Wang RB, Zheludev A, Smirnov AI, Starykh OA. Electron Spin Resonance of the Interacting Spinon Liquid. PHYSICAL REVIEW LETTERS 2022; 128:187202. [PMID: 35594098 DOI: 10.1103/physrevlett.128.187202] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Accepted: 03/25/2022] [Indexed: 06/15/2023]
Abstract
We report experimental verification of the recently predicted collective modes of spinons, stabilized by backscattering interaction, in a model quantum spin chain material. We exploit the unique geometry of uniform Dzyaloshinskii-Moriya interactions in K_{2}CuSO_{4}Br_{2} to measure the interaction-induced splitting between the two components of the electron spin resonance (ESR) response doublet. From that we directly determine the magnitude of the "marginally irrelevant" backscattering interaction between spinons for the first time.
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Affiliation(s)
- Kirill Yu Povarov
- Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
| | - Timofei A Soldatov
- P. L. Kapitza Institute for Physical Problems RAS, 119334 Moscow, Russia
| | - Ren-Bo Wang
- Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA
| | - Andrey Zheludev
- Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
| | | | - Oleg A Starykh
- Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA
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11
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C SKK, Sebastian A, Suresh A, Singh R, Kakarlamudi AC, Andrews AP, Reddy VS, Jaiswal-Nagar D. One-dimensional magnetism in a facile spin 1/2 Heisenberg antiferromagnet with a low saturation field. CrystEngComm 2022. [DOI: 10.1039/d2ce00331g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This work reports the synthesis, structure and magnetic properties of the single crystal of a facile spin 1/2 one dimensional Heisenberg antiferromagnet bis(4-aminopyridinium) bis(oxalato)cuprate(II) dihydrate, (C5H7N2)2[Cu(C2O4)2].2H2O. Single crystals of large...
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12
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Dupont M, Sherman NE, Moore JE. Spatiotemporal Crossover between Low- and High-Temperature Dynamical Regimes in the Quantum Heisenberg Magnet. PHYSICAL REVIEW LETTERS 2021; 127:107201. [PMID: 34533348 DOI: 10.1103/physrevlett.127.107201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 08/10/2021] [Indexed: 06/13/2023]
Abstract
The stranglehold of low temperatures on fascinating quantum phenomena in one-dimensional quantum magnets has been challenged recently by the discovery of anomalous spin transport at high temperatures. Whereas both regimes have been investigated separately, no study has attempted to reconcile them. For instance, the paradigmatic quantum Heisenberg spin-1/2 chain falls at low temperature within the Tomonaga-Luttinger liquid framework, while its high-temperature dynamics is superdiffusive and relates to the Kardar-Parisi-Zhang universality class in 1+1 dimensions. This Letter aims at reconciling the two regimes. Building on large-scale matrix product state simulations, we find that they are connected by a temperature-dependent spatiotemporal crossover. As the temperature T is reduced, we show that the onset of superdiffusion takes place at longer length and timescales ∝1/T. This prediction has direct consequences for experiments including nuclear magnetic resonance: it is consistent with earlier measurements on the nearly ideal Heisenberg S=1/2 chain compound Sr_{2}CuO_{3}, yet calls for new and dedicated experiments.
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Affiliation(s)
- Maxime Dupont
- Department of Physics, University of California, Berkeley, California 94720, USA and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Nicholas E Sherman
- Department of Physics, University of California, Berkeley, California 94720, USA and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Joel E Moore
- Department of Physics, University of California, Berkeley, California 94720, USA and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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Frérot I, Roscilde T. Detecting Many-Body Bell Nonlocality by Solving Ising Models. PHYSICAL REVIEW LETTERS 2021; 126:140504. [PMID: 33891467 DOI: 10.1103/physrevlett.126.140504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 11/29/2020] [Accepted: 03/05/2021] [Indexed: 06/12/2023]
Abstract
Bell nonlocality represents the ultimate consequence of quantum entanglement, fundamentally undermining the classical tenet that spatially separated degrees of freedom possess objective attributes independently of the act of their measurement. Despite its importance, probing Bell nonlocality in many-body systems is considered to be a formidable challenge, with a computational cost scaling exponentially with system size. Here we propose and validate an efficient variational scheme, based on the solution of inverse classical Ising problems, which in polynomial time can probe whether an arbitrary set of quantum data is compatible with a local theory; and, if not, it delivers the many-body Bell inequality most strongly violated by the quantum data. We use our approach to unveil new many-body Bell inequalities, violated by suitable measurements on paradigmatic quantum states (the low-energy states of Heisenberg antiferromagnets), paving the way to systematic Bell tests in the many-body realm.
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Affiliation(s)
- Irénée Frérot
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Avenida Carl Friedrich Gauss 3, 08860 Barcelona, Spain
- Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany
| | - Tommaso Roscilde
- Univ Lyon, Ens de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique, F-69342 Lyon, France
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14
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Yamashita M. Next Generation Multifunctional Nano-Science of Advanced Metal Complexes with Quantum Effect and Nonlinearity. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2021. [DOI: 10.1246/bcsj.20200257] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Masahiro Yamashita
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan
- School of Materials Science and Engineering, Nankai University, Tianjin 300350, P. R. China
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15
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Keselman A, Balents L, Starykh OA. Dynamical Signatures of Quasiparticle Interactions in Quantum Spin Chains. PHYSICAL REVIEW LETTERS 2020; 125:187201. [PMID: 33196249 DOI: 10.1103/physrevlett.125.187201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Accepted: 09/23/2020] [Indexed: 06/11/2023]
Abstract
We study the transverse dynamical susceptibility of an antiferromagnetic spin-1/2 chain in the presence of a longitudinal Zeeman field. In the low magnetization regime in the gapless phase, we show that the marginally irrelevant backscattering interaction between the spinons creates a nonzero gap between two branches of excitations at small momentum. We further demonstrate how this gap varies upon introducing a second neighbor antiferromagnetic interaction, vanishing in the limit of a noninteracting "spinon gas." In the high magnetization regime, as the Zeeman field approaches the saturation value, we uncover the appearance of two-magnon bound states in the transverse susceptibility. This bound state feature generalizes the one arising from string states in the Bethe ansatz solution of the integrable case. Our results are based on numerically accurate, unbiased matrix-product-state techniques as well as analytic approximations.
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Affiliation(s)
- Anna Keselman
- Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106, USA
| | - Leon Balents
- Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106, USA
- Canadian Institute for Advanced Research, Toronto, Ontario M5G 1M1, Canada
| | - Oleg A Starykh
- Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA
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16
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Monroe JC, Landee CP, Turnbull MM, Wikaira JL. Well-isolated pyrazine-bridged copper(II) chains: synthesis and magneto-structural analysis. J COORD CHEM 2020. [DOI: 10.1080/00958972.2020.1789972] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Jeffrey C. Monroe
- Carlson School of Chemistry and Biochemistry, Clark University, Worcester, MA, USA
| | | | - Mark M. Turnbull
- Carlson School of Chemistry and Biochemistry, Clark University, Worcester, MA, USA
| | - Jan L. Wikaira
- School of Physical and Chemical Sciences, University of Canterbury, Christchurch, New Zealand
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17
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Siemensmeyer K, Peeples CA, Tholen P, Schmitt FJ, Çoşut B, Hanna G, Yücesan G. Phosphonate Metal-Organic Frameworks: A Novel Family of Semiconductors. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2000474. [PMID: 32374449 DOI: 10.1002/adma.202000474] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Revised: 03/21/2020] [Accepted: 04/06/2020] [Indexed: 06/11/2023]
Abstract
Herein, the first semiconducting and magnetic phosphonate metal-organic framework (MOF), TUB75, is reported, which contains a 1D inorganic building unit composed of a zigzag chain of corner-sharing copper dimers. The solid-state UV-vis spectrum of TUB75 reveals the existence of a narrow bandgap of 1.4 eV, which agrees well with the density functional theory (DFT)-calculated bandgap of 1.77 eV. Single-crystal conductivity measurements for different orientations of the individual crystals yield a range of conductances from 10-3 to 103 S m-1 at room temperature, pointing to the directional nature of the electrical conductivity in TUB75. Magnetization measurements show that TUB75 is composed of antiferromagnetically coupled copper dimer chains. Due to their rich structural chemistry and exceptionally high thermal/chemical stabilities, phosphonate MOFs like TUB75 may open new vistas in engineerable electrodes for supercapacitors.
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18
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Dally RL, Heng AJR, Keselman A, Bordelon MM, Stone MB, Balents L, Wilson SD. Three-Magnon Bound State in the Quasi-One-Dimensional Antiferromagnet α-NaMnO_{2}. PHYSICAL REVIEW LETTERS 2020; 124:197203. [PMID: 32469556 DOI: 10.1103/physrevlett.124.197203] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Accepted: 04/29/2020] [Indexed: 06/11/2023]
Abstract
Here we report on the formation of a three-magnon bound state in the quasi-one-dimensional antiferromagnet α-NaMnO_{2}, where the single-ion, uniaxial anisotropy inherent to the Mn^{3+} ions in this material provides a binding mechanism capable of stabilizing higher order magnon bound states. While such states have long remained elusive in studies of antiferromagnetic chains, neutron scattering data presented here demonstrate that higher order n>2 composite magnons exist, and, specifically, that a weak three-magnon bound state is detected below the antiferromagnetic ordering transition of NaMnO_{2}. We corroborate our findings with exact numerical simulations of a one-dimensional Heisenberg chain with easy-axis anisotropy using matrix-product state techniques, finding a good quantitative agreement with the experiment. These results establish α-NaMnO_{2} as a unique platform for exploring the dynamics of composite magnon states inherent to a classical antiferromagnetic spin chain with Ising-like single ion anisotropy.
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Affiliation(s)
- Rebecca L Dally
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
- Materials Department, University of California, Santa Barbara, California 93106, USA
| | - Alvin J R Heng
- Kavli Institute for Theoretical Physics, University of California, Santa Barbara, Santa Barbara, California 93106, USA
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Anna Keselman
- Kavli Institute for Theoretical Physics, University of California, Santa Barbara, Santa Barbara, California 93106, USA
| | - Mitchell M Bordelon
- Materials Department, University of California, Santa Barbara, California 93106, USA
| | - Matthew B Stone
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Leon Balents
- Kavli Institute for Theoretical Physics, University of California, Santa Barbara, Santa Barbara, California 93106, USA
| | - Stephen D Wilson
- Materials Department, University of California, Santa Barbara, California 93106, USA
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19
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Tutsch U, Tsyplyatyev O, Kuhnt M, Postulka L, Wolf B, Cong PT, Ritter F, Krellner C, Aßmus W, Schmidt B, Thalmeier P, Kopietz P, Lang M. Specific Heat Study of 1D and 2D Excitations in the Layered Frustrated Quantum Antiferromagnets Cs_{2}CuCl_{4-x}Br_{x}. PHYSICAL REVIEW LETTERS 2019; 123:147202. [PMID: 31702204 DOI: 10.1103/physrevlett.123.147202] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 05/30/2019] [Indexed: 06/10/2023]
Abstract
We report an experimental and theoretical study of the low-temperature specific heat C and magnetic susceptibility χ of the layered anisotropic triangular-lattice spin-1/2 Heisenberg antiferromagnets Cs_{2}CuCl_{4-x}Br_{x} with x=0, 1, 2, and 4. We find that the ratio J^{'}/J of the exchange couplings ranges from 0.32 to ≈0.78, implying a change (crossover or quantum phase transition) in the materials' magnetic properties from one-dimensional (1D) behavior for J^{'}/J<0.6 to two-dimensional (2D) behavior for J^{'}/J≈0.78. For J^{'}/J<0.6, realized for x=0, 1, and 4, we find a magnetic contribution to the low-temperature specific heat, C_{m}∝T, consistent with spinon excitations in 1D spin-1/2 Heisenberg antiferromagnets. Remarkably, for x=2, where J^{'}/J≈0.78 implies a 2D magnetic character, we also observe C_{m}∝T. This finding, which contrasts the prediction of C_{m}∝T^{2} made by standard spin-wave theories, shows that Fermi-like statistics also plays a significant role for the magnetic excitations in spin-1/2 frustrated 2D antiferromagnets.
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Affiliation(s)
- U Tutsch
- Physikalisches Institut, Goethe-Universität, 60438 Frankfurt (M), Germany
| | - O Tsyplyatyev
- Institut für Theoretische Physik, Goethe-Universität, 60438 Frankfurt (M), Germany
| | - M Kuhnt
- Physikalisches Institut, Goethe-Universität, 60438 Frankfurt (M), Germany
| | - L Postulka
- Physikalisches Institut, Goethe-Universität, 60438 Frankfurt (M), Germany
| | - B Wolf
- Physikalisches Institut, Goethe-Universität, 60438 Frankfurt (M), Germany
| | - P T Cong
- Physikalisches Institut, Goethe-Universität, 60438 Frankfurt (M), Germany
| | - F Ritter
- Physikalisches Institut, Goethe-Universität, 60438 Frankfurt (M), Germany
| | - C Krellner
- Physikalisches Institut, Goethe-Universität, 60438 Frankfurt (M), Germany
| | - W Aßmus
- Physikalisches Institut, Goethe-Universität, 60438 Frankfurt (M), Germany
| | - B Schmidt
- Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany
| | - P Thalmeier
- Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany
| | - P Kopietz
- Institut für Theoretische Physik, Goethe-Universität, 60438 Frankfurt (M), Germany
| | - M Lang
- Physikalisches Institut, Goethe-Universität, 60438 Frankfurt (M), Germany
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20
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Kenny EP, Jacko AC, Powell BJ. Mechanomagnetics in Elastic Crystals: Insights from [Cu(acac) 2 ]. Angew Chem Int Ed Engl 2019; 58:15082-15088. [PMID: 31452321 DOI: 10.1002/anie.201907889] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Indexed: 11/11/2022]
Abstract
We predict that the magnetic properties of [Cu(acac)2 ], an elastically flexible crystal, change drastically when the crystal is bent. It is found that unbent [Cu(acac)2 ] is an almost perfect Tomonaga-Luttinger liquid. Broken-symmetry density-functional calculations reveal that the magnetic exchange interactions along the chains are an order of magnitude larger than the interchain exchange. The geometrically frustrated interchain interactions cannot magnetically order the material at any experimentally accessible temperature. The ordering temperature (TN ), calculated from the chain-random-phase approximation, increases by 24 orders of magnitude when the material is bent. We demonstrate that geometric frustration both suppresses TN and enhances the sensitivity of TN to bending. In [Cu(acac)2 ], TN is extremely sensitive to bending but remains too low for practical applications, even when bent. Partially frustrated materials could achieve the balance of high TN and good sensitivity to bending required for practical applications of mechanomagnetic elastic crystals.
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Affiliation(s)
- Elise P Kenny
- School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland, Australia
| | - Anthony C Jacko
- School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland, Australia
| | - Ben J Powell
- School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland, Australia
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21
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Kenny EP, Jacko AC, Powell BJ. Mechanomagnetics in Elastic Crystals: Insights from [Cu(acac)
2
]. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201907889] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Elise P. Kenny
- School of Mathematics and Physics The University of Queensland Brisbane Queensland Australia
| | - Anthony C. Jacko
- School of Mathematics and Physics The University of Queensland Brisbane Queensland Australia
| | - Ben J. Powell
- School of Mathematics and Physics The University of Queensland Brisbane Queensland Australia
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22
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Powell BJ, Kenny EP, Merino J. Dynamical Reduction of the Dimensionality of Exchange Interactions and the "Spin-Liquid" Phase of κ-(BEDT-TTF)_{2}X. PHYSICAL REVIEW LETTERS 2017; 119:087204. [PMID: 28952764 DOI: 10.1103/physrevlett.119.087204] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Indexed: 06/07/2023]
Abstract
We show that the anisotropy of the effective spin model for the dimer Mott insulator phase of κ-(BEDT-TTF)_{2}X salts is dramatically different from that of the underlying tight-binding model. Intradimer quantum interference results in a model of coupled spin chains, where frustrated interchain interactions suppress long-range magnetic order. Thus, we argue, the "spin liquid" phase observed in some of these materials is a remnant of the Tomonaga-Luttinger physics of a single chain. This is consistent with previous experiments and resolves some outstanding puzzles.
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Affiliation(s)
- B J Powell
- School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - E P Kenny
- School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - J Merino
- Departamento de Física Teórica de la Materia Condensada, Condensed Matter Physics Center (IFIMAC) and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, Madrid 28049, Spain
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23
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Peierls and Spin-Peierls Instabilities in the Per2[M(mnt)2] Series of One-Dimensional Organic Conductors; Experimental Realization of a 1D Kondo Lattice for M = Pd, Ni and Pt. MAGNETOCHEMISTRY 2017. [DOI: 10.3390/magnetochemistry3010013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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24
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Xia M, Shen S, Lu J, Sun Y, Li R. Ba2Cu2Te2P2O13: A new telluro-phosphate with S=1/2 Heisenberg chain. J SOLID STATE CHEM 2015. [DOI: 10.1016/j.jssc.2015.06.023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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25
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Klanjšek M, Arčon D, Sans A, Adler P, Jansen M, Felser C. Phonon-Modulated Magnetic Interactions and Spin Tomonaga-Luttinger Liquid in the p-Orbital Antiferromagnet CsO2. PHYSICAL REVIEW LETTERS 2015; 115:057205. [PMID: 26274439 DOI: 10.1103/physrevlett.115.057205] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Indexed: 06/04/2023]
Abstract
The magnetic response of antiferromagnetic CsO2, coming from the p-orbital S=1/2 spins of anionic O2(-) molecules, is followed by 133Cs nuclear magnetic resonance across the structural phase transition occurring at T(s1)=61 K on cooling. Above T(s1), where spins form a square magnetic lattice, we observe a huge, nonmonotonic temperature dependence of the exchange coupling originating from thermal librations of O2(-) molecules. Below T(s1), where antiferromagnetic spin chains are formed as a result of p-orbital ordering, we observe a spin Tomonaga-Luttinger-liquid behavior of spin dynamics. These two interesting phenomena, which provide rare simple manifestations of the coupling between spin, lattice, and orbital degrees of freedom, establish CsO2 as a model system for molecular solids.
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Affiliation(s)
- M Klanjšek
- Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
- EN-FIST Centre of Excellence, Trg OF 13, 1000 Ljubljana, Slovenia
| | - D Arčon
- Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
- Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia
| | - A Sans
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
- Institute for Inorganic Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - P Adler
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - M Jansen
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
- Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
| | - C Felser
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
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26
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Kono Y, Sakakibara T, Aoyama CP, Hotta C, Turnbull MM, Landee CP, Takano Y. Field-induced quantum criticality and universal temperature dependence of the magnetization of a spin-1/2 heisenberg chain. PHYSICAL REVIEW LETTERS 2015; 114:037202. [PMID: 25659018 DOI: 10.1103/physrevlett.114.037202] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Indexed: 06/04/2023]
Abstract
High-precision dc magnetization measurements have been made on Cu(C4H4N2) (NO3)2 in magnetic fields up to 14.7 T, slightly above the saturation field Hs=13.97 T, in the temperature range from 0.08 to 15 K. The magnetization curve and differential susceptibility at the lowest temperature show excellent agreement with exact theoretical results for the spin-1/2 Heisenberg antiferromagnet in one dimension. A broad peak is observed in magnetization measured as a function of temperature, signaling a crossover to a low-temperature Tomonaga-Luttinger-liquid regime. With an increasing field, the peak moves gradually to lower temperatures, compressing the regime, and, at Hs, the magnetization exhibits a strong upturn. This quantum critical behavior of the magnetization and that of the specific heat withstand quantitative tests against theory, demonstrating that the material is a practically perfect one-dimensional spin-1/2 Heisenberg antiferromagnet.
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Affiliation(s)
- Y Kono
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - T Sakakibara
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - C P Aoyama
- Department of Physics, University of Florida, Gainesville, Florida 32611-8440, USA
| | - C Hotta
- Department of Basic Science, University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan
| | - M M Turnbull
- Carlson School of Chemistry and Department of Physics, Clark University, Worcester, Massachusetts 01610-1477, USA
| | - C P Landee
- Carlson School of Chemistry and Department of Physics, Clark University, Worcester, Massachusetts 01610-1477, USA
| | - Y Takano
- Department of Physics, University of Florida, Gainesville, Florida 32611-8440, USA
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27
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Fujii Y, Kikuchi H, Nakagawa K, Takada SY, Fujisawa M. 1H-NMR Study of Spin-1/2 Triple-chain Magnet Cu3(OH)4MoO4. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.phpro.2015.12.075] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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28
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Liu ZQ, Kubo K, Lin L, Hoshino N, Noro SI, Akutagawa T, Nakamura T. Molecular motion in pyridazinium/crown ether supramolecular cation salts of a nickel dithiolene complex. Dalton Trans 2013; 42:2930-9. [DOI: 10.1039/c2dt32542j] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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29
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30
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Menard MC, Ishii R, Nakatsuji S, Chan JY. Structure and magnetism of the quasi-1-d K4Cu(MoO4)3 and the structure of K4Zn(MoO4)3. Inorg Chem 2011; 50:8767-73. [PMID: 21853975 DOI: 10.1021/ic200476n] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Single crystals of K(4)Cu(MoO(4))(3) and nonmagnetic K(4)Zn(MoO(4))(3) have been grown by the flux-growth method. K(4)Cu(MoO(4))(3) can be described as a quantum quasi-1-d antiferromagnet with correlations between neighboring Cu(2+) ions but no magnetic long-range ordering down to 0.4 K. Comparison of the structure and magnetic properties of isostructural A(4)Cu(MoO(4))(3) (A = K, Rb) allows the isolation of the effects of low dimensionality from structural distortion along the Cu-O-Mo chains. The characteristic one-dimensional behavior is hence suppressed to lower the temperature in K(4)Cu(MoO(4))(3) in comparison with that of the Rb analogue. For example, a broad peak in the specific heat is observed ~2.3 K at 0 T, which is consistent with the onset of the quantum spin liquid state.
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Affiliation(s)
- Melissa C Menard
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
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31
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Abstract
Abstract
An overview is presented of the various oxidic compounds, that exhibit low-dimensional magnetic properties. These include spin-ladder and spin-chain compounds as well as compounds with a low-dimensional electronic band responsible for the magnetic order. The basic structures at room temperature are presented, and their dimensionality is discussed. The structural variations with temperature and magnetic field are analysed. Particular attention is given to the superstructures as they occur upon phase transitions involving the development of magnetic order and charge order. The consequences of these superstructures for the interpretation of the physical properties are reviewed.
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32
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Ishii R, Gautreaux D, Onuma K, Machida Y, Maeno Y, Nakatsuji S, Chan JY. Low-dimensional structure and magnetism of the quantum antiferromagnet Rb4Cu(MoO4)3 and the structure of Rb4Zn(MoO4)3. J Am Chem Soc 2010; 132:7055-61. [PMID: 20429555 DOI: 10.1021/ja100077v] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Single crystals of the quantum low-dimensional antiferromagnet Rb(4)Cu(MoO(4))(3) and the nonmagnetic analogue Ru(4)Zn(MoO(4))(3) have been synthesized by a flux-growth method. Detailed structural studies indicate that the Cu(II)-O network separated by a MoO(4) layer has a strongly anisotropic hybridization along the a-axis, forming a quasi-one-dimensional (1-d) chain of Cu(II) S = 1/2 spins. Furthermore, our low-temperature thermodynamic measurements have revealed that a quantum paramagnetic state with Wilson ratio approximately 2 remains stable down to at least 0.1 K, 100 times lower than the intrachain antiferromagnetic coupling scale. The low-temperature magnetic and thermal properties are found to be consistent with theoretical predictions made for a 1-d network of S = 1/2 spins.
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Affiliation(s)
- Rieko Ishii
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
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33
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Kustov EF, Kalinnikov VT, Novotortsev VM. Unitary symmetry and classification of the states of n-spin clusters. Magnetic and thermodynamic parameters. RUSS J INORG CHEM+ 2009. [DOI: 10.1134/s0036023609140034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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34
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Yamada T, Maruta G, Takeda S. Determination of spin susceptibility and intrachain exchange interaction of S= 1/2 one-dimensional antiferromagnetic Heisenberg chain [Cu(OH)(NO3)(pydz)]H2O by solid-state high-resolution NMR. Polyhedron 2009. [DOI: 10.1016/j.poly.2009.01.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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35
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Kubo K, Nakao A, Ishii Y, Yamamoto T, Tamura M, Kato R, Yakushi K, Matsubayashi GE. Electrical Properties and Electronic States of Molecular Conductors Based on Unsymmetrical Organometallic-Dithiolene Gold(III) Complexes. Inorg Chem 2008; 47:5495-502. [DOI: 10.1021/ic800176q] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kazuya Kubo
- RIKEN, JST-CREST, 2-1, Hirosawa, Wako-shi, Saitama 351-0198, Japan, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan, Institute of Molecular Science, Myodaiji, Okazaki 444-8585, Japan, and Department of Molecular Chemistry Graduate School of Engineering, Osaka University, 2-1, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Akiko Nakao
- RIKEN, JST-CREST, 2-1, Hirosawa, Wako-shi, Saitama 351-0198, Japan, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan, Institute of Molecular Science, Myodaiji, Okazaki 444-8585, Japan, and Department of Molecular Chemistry Graduate School of Engineering, Osaka University, 2-1, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yasuyuki Ishii
- RIKEN, JST-CREST, 2-1, Hirosawa, Wako-shi, Saitama 351-0198, Japan, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan, Institute of Molecular Science, Myodaiji, Okazaki 444-8585, Japan, and Department of Molecular Chemistry Graduate School of Engineering, Osaka University, 2-1, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Takashi Yamamoto
- RIKEN, JST-CREST, 2-1, Hirosawa, Wako-shi, Saitama 351-0198, Japan, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan, Institute of Molecular Science, Myodaiji, Okazaki 444-8585, Japan, and Department of Molecular Chemistry Graduate School of Engineering, Osaka University, 2-1, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Masafumi Tamura
- RIKEN, JST-CREST, 2-1, Hirosawa, Wako-shi, Saitama 351-0198, Japan, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan, Institute of Molecular Science, Myodaiji, Okazaki 444-8585, Japan, and Department of Molecular Chemistry Graduate School of Engineering, Osaka University, 2-1, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Reizo Kato
- RIKEN, JST-CREST, 2-1, Hirosawa, Wako-shi, Saitama 351-0198, Japan, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan, Institute of Molecular Science, Myodaiji, Okazaki 444-8585, Japan, and Department of Molecular Chemistry Graduate School of Engineering, Osaka University, 2-1, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Kyuya Yakushi
- RIKEN, JST-CREST, 2-1, Hirosawa, Wako-shi, Saitama 351-0198, Japan, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan, Institute of Molecular Science, Myodaiji, Okazaki 444-8585, Japan, and Department of Molecular Chemistry Graduate School of Engineering, Osaka University, 2-1, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Gen-etsu Matsubayashi
- RIKEN, JST-CREST, 2-1, Hirosawa, Wako-shi, Saitama 351-0198, Japan, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan, Institute of Molecular Science, Myodaiji, Okazaki 444-8585, Japan, and Department of Molecular Chemistry Graduate School of Engineering, Osaka University, 2-1, Yamadaoka, Suita, Osaka 565-0871, Japan
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Integrability of quantum chains: Theory and applications to the spin-1/2 XXZ chain. ACTA ACUST UNITED AC 2008. [DOI: 10.1007/bfb0119598] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/10/2023]
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38
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Takaishi S, Yamashita M. One-dimensional Halogen-bridged NiIIICompounds: Chemistry and Physics in Strongly Correlated Electron Systems. CHEM LETT 2008. [DOI: 10.1246/cl.2008.382] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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39
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Deng Y, Liu J, Wu B, Ambrus C, Keene TD, Waldmann O, Liu S, Decurtins S, Yang X. Comparing Models for
S
= 1/2 Heisenberg Antiferromagnetic Chains: The Validity of Different Approaches for Describing a One‐Dimensional Coordination Polymer, [Cu
II
(HL)
2
(4,4′‐bpy)]
n
·2
n
H
2
O (H
2
L = 3‐Nitrophthalic Acid, bpy = Bipyridine). Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200701134] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yu‐Heng Deng
- Department of Chemistry, Capital Normal University, Beijing 100037, China
| | - Juan Liu
- Department of Chemistry, Capital Normal University, Beijing 100037, China
| | - Biao Wu
- State Key Laboratory for Oxo Synthesis & Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Christina Ambrus
- Department of Chemistry and Biochemistry, University of Berne, Freiestrasse 3, 3012 Berne, Switzerland
| | - Tony D. Keene
- Department of Chemistry and Biochemistry, University of Berne, Freiestrasse 3, 3012 Berne, Switzerland
| | - Oliver Waldmann
- Department of Chemistry and Biochemistry, University of Berne, Freiestrasse 3, 3012 Berne, Switzerland
- Present address: Physikalisches Institut, Universität Freiburg, 79104 Freiburg, Germany
| | - Shi‐Xia Liu
- Department of Chemistry and Biochemistry, University of Berne, Freiestrasse 3, 3012 Berne, Switzerland
| | - Silvio Decurtins
- Department of Chemistry and Biochemistry, University of Berne, Freiestrasse 3, 3012 Berne, Switzerland
| | - Xiao‐Juan Yang
- State Key Laboratory for Oxo Synthesis & Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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40
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Takaishi S, Yamashita M, Matsuzaki H, Okamoto H, Tanaka H, Kuroda SI, Goto A, Shimizu T, Takenobu T, Iwasa Y. One-Dimensional Bromo-Bridged NiIII Complexes [Ni(S,S-bn)2Br]Br2 (S,S-bn=2S,3S-diaminobutane): Synthesis, Physical Properties, and Electrostatic Carrier Doping. Chemistry 2008; 14:472-7. [DOI: 10.1002/chem.200701299] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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41
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Schwingenschlögl U, Schuster C. Magnetic ground state of coupled edge-sharing CuO2 spin chains. PHYSICAL REVIEW LETTERS 2007; 99:237206. [PMID: 18233408 DOI: 10.1103/physrevlett.99.237206] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2007] [Indexed: 05/25/2023]
Abstract
By means of density functional theory, we investigate the magnetic ground state of edge-sharing CuO2 spin chains, as found in the (La,Ca,Sr)14Cu24O41 system, for instance. Our data rely on spin-polarized electronic structure calculations including on-site interaction [local density approximation plus the multiorbital mean-field Hubbard model (LDA+U)] and an effective model for the interchain coupling. Strong doping dependence of the magnetic order is characteristic for edge-sharing CuO2 spin chains. We determine the ground state magnetic structure as function of the spin-chain filling and quantify the competing exchange interactions.
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42
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Filippetti A, Fiorentini V. Magnetic ordering under strain and spin-Peierls dimerization in GeCuO3. PHYSICAL REVIEW LETTERS 2007; 98:196403. [PMID: 17677639 DOI: 10.1103/physrevlett.98.196403] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2006] [Indexed: 05/16/2023]
Abstract
Studying from first principles the competition between ferromagnetic (FM) and antiferromagnetic (AF) interactions in the charge-transfer-insulator GeCuO3, we predict that a small external pressure should switch the uniform AF ground state to FM, and estimate (using exchange parameters computed as a function of strain) the competing AF couplings and the transition temperature to the dimerized spin-Peierls state. Although idealized as a one-dimensional Heisenberg antiferromagnet, GeCuO3 is found to be influenced by nonideal geometry and side groups.
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Affiliation(s)
- Alessio Filippetti
- CNR-INFM-SLACS and Dipartimento di Fisica, Università di Cagliari, I-09042 Monserrat (CA), Italy
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43
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Bewick SA, Soos ZG. Peierls transitions in ionic organic charge-transfer crystals with spin and charge degrees of freedom. J Phys Chem B 2006; 110:18748-57. [PMID: 16986864 DOI: 10.1021/jp0552022] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The quasi-one-dimensional electronic structure of organic charge-transfer (CT) salts rationalizes Peierls transitions in mixed or segregated stacks of pi-electron donors (D) and acceptors (A). A microscopic Peierls-Hubbard model, HCT, is presented for CT salts with mixed stacks (Drho+Arho-)n and ionicity rho > 0.7. Dimerization opens a Peierls gap that, due to electron correlation, is the singlet-triplet gap, EST. In contrast to spin-Peierls systems, such as Heisenberg spin chains with rho = 1 and TSP < 20 K, Peierls transitions in CT salts with rho < 1 occur at higher TP and involve both spin and charge degrees of freedom. Linear electron-phonon coupling and an adiabatic approximation for a harmonic lattice are used to model the dimerization amplitude deltaT for T < TP, the magnetic (spin) susceptibility chiT, and the relative infrared intensity of totally symmetric molecular modes. Exact thermodynamics of HCT for stacks up to N = 12 sites are applied to two CT salts with TP approximately 50 and 120 K whose magnetism and infrared have not been modeled previously and to CT salts with inaccessibly high TP > 350 K whose description has been difficult. Ionic CT salts are correlated Peierls systems with a degenerate ground state (GS) at T = 0 whose elementary excitations are spin solitons, while dimerized ion-radical stacks that support triplet-spin excitons have nondegenerate GS. In less ionic CT salts, modulation of HCT parameters on cooling or under pressure leads to Peierls and/or neutral-ionic transitions of the GS, without appreciable thermal population of excited states. Correlations change the gap equation that relates EST at T = 0 to TP compared to free electrons, and size convergence is fast in stacks with large delta0 and high TP.
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Affiliation(s)
- S A Bewick
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
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44
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Takagi S, Tanaka M, Deguchi H, Mito M, Takeda K. A Typical S=1/2 One-Dimensional Heisenberg Antiferromagnet: [3,3′-Diethyl-2,2′-Oxacarbocyanine]-TCNQF4. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587259908023323] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Seishi Takagi
- a Department of Physics, Faculty of Engineering , Kyushu Institute of Technology , Kitakyushu , 804-8550 , Japan
| | - Masaharu Tanaka
- a Department of Physics, Faculty of Engineering , Kyushu Institute of Technology , Kitakyushu , 804-8550 , Japan
| | - Hiroyuki Deguchi
- a Department of Physics, Faculty of Engineering , Kyushu Institute of Technology , Kitakyushu , 804-8550 , Japan
| | - Masaki Mito
- b Institute of Environmental Systems, Faculty of Engineering, Kyushu University , Fukuoka , 812-8581 , Japan
| | - Kazuyoshi Takeda
- b Institute of Environmental Systems, Faculty of Engineering, Kyushu University , Fukuoka , 812-8581 , Japan
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45
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Pratt FL, Blundell SJ, Lancaster T, Baines C, Takagi S. Low-temperature spin diffusion in a highly ideal S=1/2 Heisenberg antiferromagnetic chain studied by muon spin relaxation. PHYSICAL REVIEW LETTERS 2006; 96:247203. [PMID: 16907276 DOI: 10.1103/physrevlett.96.247203] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2006] [Indexed: 05/11/2023]
Abstract
The organic radical-ion salt DEOCC-TCNQF4 contains linear chains of stacked molecules with significant Heisenberg antiferromagnet interactions along the chain and extremely weak interactions between the chains. Zero-field muSR has confirmed the absence of long-range magnetic order down to 20 mK and field-dependent muSR is found to be consistent with diffusive motion of the spin excitations. The anisotropic spin dynamics and the upper boundary for magnetic ordering temperature both indicate interchain magnetic coupling /J'/<7 mK. As the intrachain coupling J is 110 K, /J'/J/ is significantly less than 10(-4). This system therefore provides one of the most ideal examples of the one-dimensional S=1/2 Heisenberg antiferromagnet yet discovered.
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Affiliation(s)
- F L Pratt
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, United Kingdom
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46
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Takaishi S, Kawakami D, Yamashita M, Sasaki M, Kajiwara T, Miyasaka H, Sugiura KI, Wakabayashi Y, Sawa H, Matsuzaki H, Kishida H, Okamoto H, Watanabe H, Tanaka H, Marumoto K, Ito H, Kuroda SI. Dynamical Valence Fluctuation at the Charge−Density−Wave Phase Boundary in Iodide-Bridged Pt Compound [Pt(chxn)2I]I2. J Am Chem Soc 2006; 128:6420-5. [PMID: 16683807 DOI: 10.1021/ja060193b] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We synthesized a novel iodo-bridged linear chain platinum compound, having the quasi-two-dimensional charge-density-wave (CDW) ground state and the smallest band gap. In this compound, we discovered an anomalous valence state in the boundary region at which the CDW phase alternates in the crystal by means of ESR, X-ray diffuse scattering, STM, and electrical resistivity. This anomalous state can be explained by the fast fluctuation between Pt(IV)-I...Pt(II) and Pt(II)...I-Pt(IV) in the double well potential. This is the first observation of the dynamical fluctuation of the CDW phase among the quasi one-dimensional halogen-bridged complexes.
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Affiliation(s)
- Shinya Takaishi
- Department of Chemistry, Graduate School of Science, Tohoku University and CREST (JST), 6-3 Aza-aoba, Aramaki, Sendai 980-8578, Japan.
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47
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Real-space treatment of spin-Peierls transitions: Gap equation and magnetic crossover of the linear Heisenberg antiferromagnet. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2006.01.047] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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48
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Rakitin YV, Starodub OR, Rakitina VM, Kalinnikov VT, Novotortsev VM. Magnetic and thermodynamic properties of Heisenberg chains and n-nuclear cyclic clusters: S
i
= 3/2 (n ≤ 11, n → ∞) and S
i
= 2 (n ≤ 10, n → ∞) systems. RUSS J INORG CHEM+ 2006. [DOI: 10.1134/s0036023606030144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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49
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Affiliation(s)
- T Giamarchi
- University of Geneva, 24 Quai Ernest Ansermet, 1211 Geneva, Switzerland
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50
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Filippetti A, Fiorentini V. Magnetic ordering in CuO from first principles: a cuprate antiferromagnet with fully three-dimensional exchange interactions. PHYSICAL REVIEW LETTERS 2005; 95:086405. [PMID: 16196879 DOI: 10.1103/physrevlett.95.086405] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2004] [Indexed: 05/04/2023]
Abstract
We investigate the interplay of bonding and magnetism in CuO by a first-principles self-interaction-free density-functional approach. Our analysis reveals that, at variance with typical low-dimensional cuprates, a fully three-dimensional view of the exchange interactions is needed to describe accurately the magnetic ground state and low-energy excitations in CuO. The apparent one-dimensional behavior of antiferromagnetic order is due to the presence of a single spin-polarized hole of d(z)2 character. This induces a strongly anisotropic magnetic ordering built up by ferromagnetic (x,y) layers, and antiferromagnetic chains along z, with exchange interactions of similar magnitude.
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Affiliation(s)
- Alessio Filippetti
- SLACS INFM-CNR and Dipartimento di Fisica, Università di Cagliari, I-09042 Monserrato (Ca), Italy
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