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Li C, Lin H, Yu R. Quantum scaling of the spin lattice relaxation rate in the checkerboard J-Q model. J Phys Condens Matter 2024. [PMID: 38754435 DOI: 10.1088/1361-648x/ad4ccd] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2024]
Abstract
Motivated by recent progress on the experimental realization of proximate deconfined quantum critical point in a frustrated quantum magnet, we study the low-energy spin dynamics of a related checkerboard J-Q model by using quantum Monte Carlo simulations. The ground state of this model undergoes a weakly first-order quantum phase transition with an emergent O(4) symmetry between an antiferromagnetic state and a plaquette valence bond solid. The calculated spin lattice relaxation rate of nuclear magnetic resonance, 1/T1, exhibits distinct low-temperature behaviors depending on the ground states. With decreasing the temperature, 1/T1 rises up on the antiferromagnetic side, characterizing a crossover to the renormalized classical regime, whereas 1/T1 drops exponentially on the side of valence bond solid, reflecting the gap opening in the plaquette ordered phase. The extracted spin gap scales with the distance to the transition point as a power-law with an exponent φ ≈ 0.3, consistent with the scaling ansatz φ = νz with ν ≈ 0.3 and z = 1. Near the quantum phase transition, the temperature dependent 1/T1 shows a broad crossover regime where a universal scaling 1/T1 ∼ T η with η ≈ 0.6 is found. Our results suggest a quantum scaling regime associated with the emergent enhanced symmetry near this first-order quantum phase transition.
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Affiliation(s)
- Chengchen Li
- Department of Physics, Renmin University of China, 59 Zhong Guan Cun Street, Beijing, 100872, CHINA
| | - Huihang Lin
- Department of Physics, Renmin University of China, 59 Zhong Guan Cun Street, Beijing, 100872, CHINA
| | - Rong Yu
- Department of Physics, Renmin University of China, 59 Zhong Guan Cun Street, Beijing, 100872, CHINA
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2
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Cutler DJ, Canaj AB, Singh MK, Nichol GS, Gracia D, Nojiri H, Evangelisti M, Schnack J, Brechin EK. Odd and Even Numbered Ferric Wheels. Adv Sci (Weinh) 2023; 10:e2304553. [PMID: 37635185 PMCID: PMC10625049 DOI: 10.1002/advs.202304553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 08/04/2023] [Indexed: 08/29/2023]
Abstract
The structurally related odd and even numbered wheels [FeIII 11 ZnII 4 (tea)10 (teaH)1 (OMe)Cl8 ] (1) and [FeIII 12 ZnII 4 (tea)12 Cl8 ] (2) can be synthesized under ambient conditions by reacting FeIII and ZnII salts with triethanolamine (teaH3 ), the change in nuclearity being dictated by the solvents employed. An antiferromagnetic exchange between nearest neighbors, J = -10.0 cm-1 for 1 and J = -12.0 cm-1 for 2, leads to a frustrated S = 1/2 ground state in the former and an S = 0 ground state in the latter.
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Affiliation(s)
- Daniel J. Cutler
- EaStCHEM School of ChemistryThe University of EdinburghDavid Brewster RoadEdinburghEH9 3FJUK
| | - Angelos B. Canaj
- EaStCHEM School of ChemistryThe University of EdinburghDavid Brewster RoadEdinburghEH9 3FJUK
| | - Mukesh K. Singh
- EaStCHEM School of ChemistryThe University of EdinburghDavid Brewster RoadEdinburghEH9 3FJUK
| | - Gary S. Nichol
- EaStCHEM School of ChemistryThe University of EdinburghDavid Brewster RoadEdinburghEH9 3FJUK
| | - David Gracia
- Instituto de Nanociencia y Materiales de Aragón (INMA)CSIC & Universidad de ZaragozaZaragoza50009Spain
| | - Hiroyuki Nojiri
- Institute for Materials ResearchTohoku UniversityKatahira 2‐1‐1Sendai980–8577Japan
| | - Marco Evangelisti
- Instituto de Nanociencia y Materiales de Aragón (INMA)CSIC & Universidad de ZaragozaZaragoza50009Spain
| | - Jürgen Schnack
- Universität Bielefeld | Fakultät für PhysikPostfach 100131D‐33501BielefeldGermany
| | - Euan K. Brechin
- EaStCHEM School of ChemistryThe University of EdinburghDavid Brewster RoadEdinburghEH9 3FJUK
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3
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Sheng J, Wang L, Candini A, Jiang W, Huang L, Xi B, Zhao J, Ge H, Zhao N, Fu Y, Ren J, Yang J, Miao P, Tong X, Yu D, Wang S, Liu Q, Kofu M, Mole R, Biasiol G, Yu D, Zaliznyak IA, Mei JW, Wu L. Two-dimensional quantum universality in the spin-1/2 triangular-lattice quantum antiferromagnet Na(2)BaCo(PO(4))(2). Proc Natl Acad Sci U S A 2022; 119:e2211193119. [PMID: 36520670 DOI: 10.1073/pnas.2211193119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
An interplay of geometrical frustration and strong quantum fluctuations in a spin-1/2 triangular-lattice antiferromagnet (TAF) can lead to exotic quantum states. Here, we report the neutron-scattering, magnetization, specific heat, and magnetocaloric studies of the recently discovered spin-1/2 TAF Na2BaCo(PO4)2, which can be described by a spin-1/2 easy axis XXZ model. The zero-field neutron diffraction experiment reveals an incommensurate antiferromagnetic ground state with a significantly reduced ordered moment of about 0.54(2) μB/Co. Different magnetic phase diagrams with magnetic fields in the ab plane and along the easy c-axis were extracted based on the magnetic susceptibility, specific heat, and elastic neutron-scattering results. In addition, two-dimensional (2D) spin dispersion in the triangular plane was observed in the high-field polarized state, and microscopic exchange parameters of the spin Hamiltonian have been determined through the linear spin wave theory. Consistently, quantum critical behaviors with the universality class of d = 2 and νz = 1 were established in the vicinity of the saturation field, where a Bose-Einstein condensation (BEC) of diluted magnons occurs. The newly discovered quantum criticality and fractional magnetization phase in this ideal spin-1/2 TAF present exciting opportunities for exploring exotic quantum phenomena.
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4
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Hua E, Si L, Dai K, Wang Q, Ye H, Liu K, Zhang J, Lu J, Chen K, Jin F, Wang L, Wu W. Ru-Doping-Induced Spin Frustration and Enhancement of the Room-Temperature Anomalous Hall Effect in La 2/3 Sr 1/3 MnO 3 Films. Adv Mater 2022; 34:e2206685. [PMID: 36120849 DOI: 10.1002/adma.202206685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 09/10/2022] [Indexed: 06/15/2023]
Abstract
In transition-metal-oxide heterostructures, the anomalous Hall effect (AHE) is a powerful tool for detecting the magnetic state and revealing intriguing interfacial magnetic orderings. However, achieving a larger AHE at room temperature in oxide heterostructures is still challenging due to the dilemma of mutually strong spin-orbit coupling and magnetic exchange interactions. Here, Ru-doping-enhanced AHE in La2/3 Sr1/3 Mn1-x Rux O3 epitaxial films is exploited. As the B-site Ru doping level increases up to 20%, the anomalous Hall resistivity at room temperature can be enhanced from nΩ cm to µΩ cm scale. Ru doping leads to strong competition between the ferromagnetic double-exchange interaction and the antiferromagnetic superexchange interaction. The resultant spin frustration and spin-glass state facilitate a strong skew-scattering process, thus significantly enhancing the extrinsic AHE. The findings can pave a feasible approach for boosting the controllability and reliability of oxide-based spintronic devices.
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Affiliation(s)
- Enda Hua
- Hefei National Research Center for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, 230026, China
| | - Liang Si
- School of Physics, Northwest University, Xi'an, 710127, China
- Institute of Solid State Physics, TU Wien, Vienna, 1040, Austria
| | - Kunjie Dai
- Hefei National Research Center for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, 230026, China
| | - Qing Wang
- Hefei National Research Center for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, 230026, China
| | - Huan Ye
- Hefei National Research Center for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, 230026, China
| | - Kuan Liu
- Hefei National Research Center for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, 230026, China
| | - Jinfeng Zhang
- Hefei National Research Center for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, 230026, China
| | - Jingdi Lu
- Hefei National Research Center for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, 230026, China
| | - Kai Chen
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230026, China
| | - Feng Jin
- Hefei National Research Center for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, 230026, China
| | - Lingfei Wang
- Hefei National Research Center for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, 230026, China
| | - Wenbin Wu
- Hefei National Research Center for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, 230026, China
- Institutes of Physical Science and Information Technology, Anhui University, Hefei, 230601, China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
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5
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Zhang SJ, Yan JM, Tang F, Wu J, Dong WQ, Zhang DW, Luo FS, Chen L, Fang Y, Zhang T, Chai Y, Zhao W, Wang X, Zheng RK. Colossal Magnetoresistance in Ti Lightly Doped Cr 2Se 3 Single Crystals with a Layered Structure. ACS Appl Mater Interfaces 2021; 13:58949-58955. [PMID: 34854300 DOI: 10.1021/acsami.1c18848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Stoichiometric Cr2Se3 single crystals are particular layer-structured antiferromagnets, which possess a noncollinear spin configuration, weak ferromagnetic moments, moderate magnetoresistance (MR ∼14.3%), and poor metallic conductivity below the antiferromagnetic phase transition. Here, we report an interesting >16 000% colossal magnetoresistance (CMR) effect in Ti (1.5 atomic percent) lightly doped Cr2Se3 single crystals. Such a CMR is approximately 1143 times larger than that of the stoichiometric Cr2Se3 crystals and is rarely observed in layered antiferromagnets and is attributed to the frustrated spin configuration. Moreover, the Ti doping not only dramatically changes the electronic conductivity of the Cr2Se3 crystal from a bad metal to a semiconductor with a gap of ∼15 meV but also induces a change in the magnetic anisotropy of the Cr2Se3 crystal from strong out-of-plane to weak in-plane. Further, magnetotransport measurements reveal that the low-field MR scales with the square of the reduced magnetization, which is a signature of CMR materials. The layered Ti:Cr2Se3 with the CMR effect could be used as two-dimensional (2D) heterostructure building blocks to provide colossal negative MR in spintronic devices.
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Affiliation(s)
- Shu-Juan Zhang
- School of Materials Science and Engineering and Jiangxi Engineering Laboratory for Advanced Functional Thin Films, Nanchang University, Nanchang 330031, China
- School of Materials and Mechanic & Electrical Engineering, Jiangxi Science and Technology Normal University, Nanchang 330038, China
| | - Jian-Min Yan
- Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong 999077, China
| | - F Tang
- Jiangsu Laboratory of Advanced Functional Materials and Department of Physics, Changshu Institute of Technology, Changshu 215500, China
| | - Jin Wu
- School of Materials Science and Engineering and Jiangxi Engineering Laboratory for Advanced Functional Thin Films, Nanchang University, Nanchang 330031, China
| | - Wei-Qi Dong
- School of Materials Science and Engineering and Jiangxi Engineering Laboratory for Advanced Functional Thin Films, Nanchang University, Nanchang 330031, China
| | - Dan-Wen Zhang
- School of Materials Science and Engineering and Jiangxi Engineering Laboratory for Advanced Functional Thin Films, Nanchang University, Nanchang 330031, China
| | - Fu-Sheng Luo
- School of Materials Science and Engineering and Jiangxi Engineering Laboratory for Advanced Functional Thin Films, Nanchang University, Nanchang 330031, China
| | - Lei Chen
- School of Materials Science and Engineering and Jiangxi Engineering Laboratory for Advanced Functional Thin Films, Nanchang University, Nanchang 330031, China
| | - Y Fang
- Jiangsu Laboratory of Advanced Functional Materials and Department of Physics, Changshu Institute of Technology, Changshu 215500, China
| | - Tao Zhang
- School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China
| | - Yang Chai
- Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong 999077, China
| | - Weiyao Zhao
- Institute for Superconducting and Electronic Materials & ARC Centre of Excellence in Future Low-Energy Electronics Technologies, Innovation Campus, University of Wollongong, North Wollongong, NSW 2500, Australia
| | - Xiaolin Wang
- Institute for Superconducting and Electronic Materials & ARC Centre of Excellence in Future Low-Energy Electronics Technologies, Innovation Campus, University of Wollongong, North Wollongong, NSW 2500, Australia
| | - Ren-Kui Zheng
- School of Materials Science and Engineering and Jiangxi Engineering Laboratory for Advanced Functional Thin Films, Nanchang University, Nanchang 330031, China
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6
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Anand K, Pal A, Alam M, Dan S, Kumar S, Ghosh S, Kumari S, Das A, Sawada M, Mohan A, Sathe VG, Chatterjee S. Emergence of metamagnetic transition, re-entrant cluster glass and spin phonon coupling in Tb 2CoMnO 6. J Phys Condens Matter 2021; 33:275802. [PMID: 33957615 DOI: 10.1088/1361-648x/abfe94] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Accepted: 05/06/2021] [Indexed: 06/12/2023]
Abstract
The double perovskite compound Tb2CoMnO6has been investigated using x-ray absorption spectroscopy (XAS), Raman spectroscopy, magnetic measurements andab initioband structure calculations. It is observed that both anti-ferromagnetic (AFM) and ferromagnetic (FM) phase coexist in this material. The presence of anti-site disorder (ASD) has been established from the analysis of neutron diffraction data. Moreover, a prominent metamagnetic transition is observed in theM(H) behavior that has been explained with the drastic reorientation of the pinned domain which are aligned antiparallel by the antiphase boundaries (APBs) at zero field. The ASD further gives rise to spin frustration at low temperature which leads to the re-entrant cluster glass ∼33 K. The coupling between phononic degree of freedom and spin in the system has also been demonstrated. It is observed that the theoretical calculation is consistent with that of the experimentally observed behavior.
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Affiliation(s)
- Khyati Anand
- Department of Physics, Indian Institute of Technology (BHU) Varanasi 221005, India
| | - Arkadeb Pal
- Department of Physics, Indian Institute of Technology (BHU) Varanasi 221005, India
| | - Mohd Alam
- Department of Physics, Indian Institute of Technology (BHU) Varanasi 221005, India
| | - Sambhab Dan
- Department of Physics, Indian Institute of Technology (BHU) Varanasi 221005, India
| | - Shiv Kumar
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Kagamiyama 2-313, Higashi Hiroshima 739-0046, Japan
| | - Surajit Ghosh
- Department of Physics, Indian Institute of Technology (BHU) Varanasi 221005, India
| | - Seema Kumari
- Department of Physics, Indian Institute of Technology (BHU) Varanasi 221005, India
| | - A Das
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Masahiro Sawada
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Kagamiyama 2-313, Higashi Hiroshima 739-0046, Japan
| | - Anita Mohan
- Department of Physics, Indian Institute of Technology (BHU) Varanasi 221005, India
| | - Vasant G Sathe
- UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, India
| | - Sandip Chatterjee
- Department of Physics, Indian Institute of Technology (BHU) Varanasi 221005, India
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7
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Dearle AE, Cutler DJ, Fraser HWL, Sanz S, Lee E, Dey S, Diaz-Ortega IF, Nichol GS, Nojiri H, Evangelisti M, Rajaraman G, Schnack J, Cronin L, Brechin EK. An [Fe III 34 ] Molecular Metal Oxide. Angew Chem Int Ed Engl 2019; 58:16903-16906. [PMID: 31535459 PMCID: PMC7186828 DOI: 10.1002/anie.201911003] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Indexed: 11/11/2022]
Abstract
The dissolution of anhydrous iron bromide in a mixture of pyridine and acetonitrile, in the presence of an organic amine, results in the formation of an [Fe34] metal oxide molecule, structurally characterised by alternate layers of tetrahedral and octahedral FeIII ions connected by oxide and hydroxide ions. The outer shell of the complex is capped by a combination of pyridine molecules and bromide ions. Magnetic data, measured at temperatures as low as 0.4 K and fields up to 35 T, reveal competing antiferromagnetic exchange interactions; DFT calculations showing that the magnitudes of the coupling constants are highly dependent on both the Fe‐O‐Fe angles and Fe−O distances. The simplicity of the synthetic methodology, and the structural similarity between [Fe34], bulk iron oxides, previous FeIII–oxo cages, and polyoxometalates (POMs), hints that much larger molecular FeIII oxides can be made.
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Affiliation(s)
- Alice E Dearle
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH93FJ, UK
| | - Daniel J Cutler
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH93FJ, UK
| | - Hector W L Fraser
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH93FJ, UK
| | - Sergio Sanz
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH93FJ, UK
| | - Edward Lee
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH93FJ, UK.,WestCHEM School of Chemistry, The University of Glasgow, University Avenue, Glasgow, G12 8QQ, UK
| | - Sourav Dey
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, 400076, India
| | | | - Gary S Nichol
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH93FJ, UK
| | - Hiroyuki Nojiri
- IMR, Tohoku Univ, Katahira 2-1-1, Aobaku, Sendai, 980-8577, Japan
| | - Marco Evangelisti
- Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, 50009, Zaragoza, Spain
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, 400076, India
| | - Jürgen Schnack
- Fakultät für Physik, Universitat Bielefeld, Postfach 100131, 33501, Bielefeld, Germany
| | - Leroy Cronin
- WestCHEM School of Chemistry, The University of Glasgow, University Avenue, Glasgow, G12 8QQ, UK
| | - Euan K Brechin
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH93FJ, UK
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8
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Wong PKJ, Zhang W, Bussolotti F, Yin X, Herng TS, Zhang L, Huang YL, Vinai G, Krishnamurthi S, Bukhvalov DW, Zheng YJ, Chua R, N'Diaye AT, Morton SA, Yang CY, Ou Yang KH, Torelli P, Chen W, Goh KEJ, Ding J, Lin MT, Brocks G, de Jong MP, Castro Neto AH, Wee ATS. Evidence of Spin Frustration in a Vanadium Diselenide Monolayer Magnet. Adv Mater 2019; 31:e1901185. [PMID: 30997712 DOI: 10.1002/adma.201901185] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Revised: 03/30/2019] [Indexed: 06/09/2023]
Abstract
Monolayer VSe2 , featuring both charge density wave and magnetism phenomena, represents a unique van der Waals magnet in the family of metallic 2D transition-metal dichalcogenides (2D-TMDs). Herein, by means of in situ microscopy and spectroscopic techniques, including scanning tunneling microscopy/spectroscopy, synchrotron X-ray and angle-resolved photoemission, and X-ray absorption, direct spectroscopic signatures are established, that identify the metallic 1T-phase and vanadium 3d1 electronic configuration in monolayer VSe2 grown on graphite by molecular-beam epitaxy. Element-specific X-ray magnetic circular dichroism, complemented with magnetic susceptibility measurements, further reveals monolayer VSe2 as a frustrated magnet, with its spins exhibiting subtle correlations, albeit in the absence of a long-range magnetic order down to 2 K and up to a 7 T magnetic field. This observation is attributed to the relative stability of the ferromagnetic and antiferromagnetic ground states, arising from its atomic-scale structural features, such as rotational disorders and edges. The results of this study extend the current understanding of metallic 2D-TMDs in the search for exotic low-dimensional quantum phenomena, and stimulate further theoretical and experimental studies on van der Waals monolayer magnets.
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Affiliation(s)
- Ping Kwan Johnny Wong
- Centre for Advanced 2D Materials (CA2DM) and Graphene Research Centre (GRC), National University of Singapore, 6 Science Drive 2, Singapore, 117546, Singapore
| | - Wen Zhang
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Singapore
| | - Fabio Bussolotti
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*Star), 2 Fusionopolis Way, Innovis, Singapore, 138634, Singapore
| | - Xinmao Yin
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Singapore
| | - Tun Seng Herng
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117575, Singapore
| | - Lei Zhang
- Centre for Advanced 2D Materials (CA2DM) and Graphene Research Centre (GRC), National University of Singapore, 6 Science Drive 2, Singapore, 117546, Singapore
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Singapore
| | - Yu Li Huang
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Singapore
| | - Giovanni Vinai
- Instituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. Km 163.5, Trieste, I-34149, Italy
| | - Sridevi Krishnamurthi
- Computational Materials Science, Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500, AE, Enschede, The Netherlands
| | - Danil W Bukhvalov
- College of Science, Institute of Materials Physics and Chemistry, Nanjing Forestry University, Nanjing, 210037, P. R. China
- Institute of Physics and Technology, Ural Federal University, Mira Street 19, 620002, Yekaterinburg, Russia
| | - Yu Jie Zheng
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Singapore
| | - Rebekah Chua
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Singapore
| | - Alpha T N'Diaye
- Advanced Light Source (ALS), Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Simon A Morton
- Advanced Light Source (ALS), Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Chao-Yao Yang
- Department of Physics, National Taiwan University, Taipei, 10617, Taiwan
| | - Kui-Hon Ou Yang
- Department of Physics, National Taiwan University, Taipei, 10617, Taiwan
| | - Piero Torelli
- Instituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. Km 163.5, Trieste, I-34149, Italy
| | - Wei Chen
- Centre for Advanced 2D Materials (CA2DM) and Graphene Research Centre (GRC), National University of Singapore, 6 Science Drive 2, Singapore, 117546, Singapore
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Singapore
- Department of Chemistry, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Singapore
| | - Kuan Eng Johnson Goh
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Singapore
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*Star), 2 Fusionopolis Way, Innovis, Singapore, 138634, Singapore
| | - Jun Ding
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117575, Singapore
| | - Minn-Tsong Lin
- Department of Physics, National Taiwan University, Taipei, 10617, Taiwan
| | - Geert Brocks
- Computational Materials Science, Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500, AE, Enschede, The Netherlands
| | - Michel P de Jong
- NanoElectronics Group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500, AE, Enschede, The Netherlands
| | - Antonio H Castro Neto
- Centre for Advanced 2D Materials (CA2DM) and Graphene Research Centre (GRC), National University of Singapore, 6 Science Drive 2, Singapore, 117546, Singapore
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Singapore
| | - Andrew Thye Shen Wee
- Centre for Advanced 2D Materials (CA2DM) and Graphene Research Centre (GRC), National University of Singapore, 6 Science Drive 2, Singapore, 117546, Singapore
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Singapore
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9
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Haraguchi Y, Michioka C, Ueda H, Yoshimura K. Highly Spin-Frustrated Magnetism in the Topochemically Prepared Triangular Lattice Cluster Magnets Na 3 A 2 (MoO 4 ) 2 Mo 3 O 8 (A=In, Sc). Chemistry 2017; 23:15879-15883. [PMID: 28994203 DOI: 10.1002/chem.201703597] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Indexed: 11/07/2022]
Abstract
The physical properties of novel cluster-based triangular lattice antiferromagnets Na3 A2 (MoO4 )2 Mo3 O8 (A=In, Sc), synthesized through a topochemical Na-intercalation to nonmagnetic Na2 A2 (MoO4 )2 Mo3 O8 , are reported. The S=1/2 [Mo3 ]11+ clusters form a regular triangular lattice, which gives the magnetic system a strong geometrical spin frustration effect. Despite the strong antiferromagnetic couplings among [Mo3 ]11+ clusters, they show no long-range magnetic orderings down to 0.5 K with the finite residual magnetic entropy. The ground states of Na3 A2 (MoO4 )2 Mo3 O8 have been characterized as a quantum spin liquid, owing to the strong spin frustration of cluster spins on the triangular lattice.
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Affiliation(s)
- Yuya Haraguchi
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan
- The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba, 277-8581, Japan
| | - Chishiro Michioka
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan
| | - Hiroaki Ueda
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan
| | - Kazuyoshi Yoshimura
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan
- Research Center for Low Temperature and Materials Sciences, Kyoto University, Kyoto, 606-8501, Japan
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10
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Woolfson RJ, Timco GA, Chiesa A, Vitorica-Yrezabal IJ, Tuna F, Guidi T, Pavarini E, Santini P, Carretta S, Winpenny REP. [CrF(O2 C(t) Bu)2 ]9 : Synthesis and Characterization of a Regular Homometallic Ring with an Odd Number of Metal Centers and Electrons. Angew Chem Int Ed Engl 2016; 55:8856-9. [PMID: 27294807 PMCID: PMC5089673 DOI: 10.1002/anie.201601734] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Revised: 03/30/2016] [Indexed: 11/24/2022]
Abstract
The first regular homometallic ring containing an odd number of metal centers is reported. The ring was synthesized by means of amine-templated self-assembly. Extensive physical characterization studies, including magnetic measurements, powder inelastic neutron scattering (INS), and DFT calculations, show that the molecule has a near perfect match to the expected behavior for a frustrated system with the lowest energy pair of S=1/2 spin states separated by only 0.1 meV (0.8 cm(-1) ).
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Affiliation(s)
- Robert J Woolfson
- School of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester, M20 4NZ, UK
| | - Grigore A Timco
- School of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester, M20 4NZ, UK
| | - Alessandro Chiesa
- Dipartimento di Fisica e Scienze della Terra, Università di Parma, Parco Area della Scienze 7/A, I-43124, Parma, Italy
| | - Inigo J Vitorica-Yrezabal
- School of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester, M20 4NZ, UK
| | - Floriana Tuna
- School of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester, M20 4NZ, UK
| | - Tatiana Guidi
- ISIS Facility, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - Eva Pavarini
- Institute for Advanced Simulation, Forschungzentrum Jülich, 52425, Jülich, Germany
- JARA High Performance Computing, RWTH Aachen University, 52062, Aachen, Germany
| | - Paolo Santini
- Dipartimento di Fisica e Scienze della Terra, Università di Parma, Parco Area della Scienze 7/A, I-43124, Parma, Italy
| | - Stefano Carretta
- Dipartimento di Fisica e Scienze della Terra, Università di Parma, Parco Area della Scienze 7/A, I-43124, Parma, Italy
| | - Richard E P Winpenny
- School of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester, M20 4NZ, UK.
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11
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Baker ML, Lancaster T, Chiesa A, Amoretti G, Baker PJ, Barker C, Blundell SJ, Carretta S, Collison D, Güdel HU, Guidi T, McInnes EJL, Möller JS, Mutka H, Ollivier J, Pratt FL, Santini P, Tuna F, Tregenna-Piggott PLW, Vitorica-Yrezabal IJ, Timco GA, Winpenny REP. Studies of a Large Odd-Numbered Odd-Electron Metal Ring: Inelastic Neutron Scattering and Muon Spin Relaxation Spectroscopy of Cr8 Mn. Chemistry 2016; 22:1779-88. [PMID: 26748964 PMCID: PMC4744977 DOI: 10.1002/chem.201503431] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Indexed: 11/05/2022]
Abstract
The spin dynamics of Cr8Mn, a nine‐membered antiferromagnetic (AF) molecular nanomagnet, are investigated. Cr8Mn is a rare example of a large odd‐membered AF ring, and has an odd‐number of 3d‐electrons present. Odd‐membered AF rings are unusual and of interest due to the presence of competing exchange interactions that result in frustrated‐spin ground states. The chemical synthesis and structures of two Cr8Mn variants that differ only in their crystal packing are reported. Evidence of spin frustration is investigated by inelastic neutron scattering (INS) and muon spin relaxation spectroscopy (μSR). From INS studies we accurately determine an appropriate microscopic spin Hamiltonian and we show that μSR is sensitive to the ground‐spin‐state crossing from S=1/2 to S=3/2 in Cr8Mn. The estimated width of the muon asymmetry resonance is consistent with the presence of an avoided crossing. The investigation of the internal spin structure of the ground state, through the analysis of spin‐pair correlations and scalar‐spin chirality, shows a non‐collinear spin structure that fluctuates between non‐planar states of opposite chiralities.
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Affiliation(s)
- Michael L Baker
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK. .,Institut Laue-Langevin, BP 156, 6 rue Jules Horowitz, 38042, Grenoble Cedex 9, France.
| | - Tom Lancaster
- Department of Physics, Durham University, South Road, Durham, DH1 3LE, UK
| | - Alessandro Chiesa
- Dipartimento di Fisica e Scienze della Terra, Università di Parma, 43124, Parma, Italy
| | - Giuseppe Amoretti
- Dipartimento di Fisica e Scienze della Terra, Università di Parma, 43124, Parma, Italy
| | - Peter J Baker
- ISIS Facility, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - Claire Barker
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Stephen J Blundell
- Clarendon Laboratory, Department of Physics, University of Oxford, OX1 3PU, UK.
| | - Stefano Carretta
- Dipartimento di Fisica e Scienze della Terra, Università di Parma, 43124, Parma, Italy
| | - David Collison
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Hans U Güdel
- Department of Chemistry and Biochemistry, University of Bern, 3000, Bern, Switzerland
| | - Tatiana Guidi
- ISIS Facility, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - Eric J L McInnes
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Johannes S Möller
- Clarendon Laboratory, Department of Physics, University of Oxford, OX1 3PU, UK
| | - Hannu Mutka
- Institut Laue-Langevin, BP 156, 6 rue Jules Horowitz, 38042, Grenoble Cedex 9, France
| | - Jacques Ollivier
- Institut Laue-Langevin, BP 156, 6 rue Jules Horowitz, 38042, Grenoble Cedex 9, France
| | - Francis L Pratt
- ISIS Facility, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - Paolo Santini
- Dipartimento di Fisica e Scienze della Terra, Università di Parma, 43124, Parma, Italy
| | - Floriana Tuna
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | | | - Iñigo J Vitorica-Yrezabal
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Grigore A Timco
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Richard E P Winpenny
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
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12
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Mondal KC, Mereacre V, Kostakis GE, Lan Y, Anson CE, Prisecaru I, Waldmann O, Powell AK. A Strongly Spin-Frustrated Fe(III) 7 Complex with a Canted Intermediate Spin Ground State of S=7/2 or 9/2. Chemistry 2015; 21:10835-42. [PMID: 26073059 DOI: 10.1002/chem.201500841] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Indexed: 11/08/2022]
Abstract
A disk-shaped [Fe(III) 7 (Cl)(MeOH)6 (μ3 -O)3 (μ-OMe)6 (PhCO2 )6 ]Cl2 complex with C3 symmetry has been synthesised and characterised. The central tetrahedral Fe(III) is 0.733 Å above the almost co-planar Fe(III) 6 wheel, to which it is connected through three μ3 -oxide bridges. For this iron-oxo core, the magnetic susceptibility analysis proposed a Heisenberg-Dirac-van Vleck (HDvV) mechanism that leads to an intermediate spin ground state of S=7/2 or 9/2. Within either of these ground state manifolds it is reasonable to expect spin frustration effects. The (57) Fe Mössbauer (MS) analysis verifies that the central Fe(III) ion easily aligns its magnetic moment antiparallel to the externally applied field direction, whereas the other six peripheral Fe(III) ions keep their moments almost perpendicular to the field at stronger fields. This unusual canted spin structure reflects spin frustration. The small linewidths in the magnetic Mössbauer spectra of polycrystalline samples clearly suggest an isotropic exchange mechanism for realisation of this peculiar spin topology.
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Affiliation(s)
- Kartik Chandra Mondal
- Institut für Anorganische Chemie, Karlsruher Institut für Technologie, Engesserstr. 15, 76131 Karslruhe (Germany)
| | - Valeriu Mereacre
- Institut für Anorganische Chemie, Karlsruher Institut für Technologie, Engesserstr. 15, 76131 Karslruhe (Germany)
| | - George E Kostakis
- Institut für Nanotechnologie, Karlsruher Institut für Technologie, Herrmann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen (Germany)
| | - Yanhua Lan
- Institut für Anorganische Chemie, Karlsruher Institut für Technologie, Engesserstr. 15, 76131 Karslruhe (Germany)
| | - Christopher E Anson
- Institut für Anorganische Chemie, Karlsruher Institut für Technologie, Engesserstr. 15, 76131 Karslruhe (Germany)
| | - Ion Prisecaru
- WMOSS.ORG, Max-Beckmann-Str. 29, 76227, Karlsruhe (Germany).
| | - Oliver Waldmann
- Physikalisches Institut, Universität Freiburg, Hermann-Herder-Strasse 3, 79104 Freiburg (Germany).
| | - Annie K Powell
- Institut für Anorganische Chemie, Karlsruher Institut für Technologie, Engesserstr. 15, 76131 Karslruhe (Germany). .,Institut für Nanotechnologie, Karlsruher Institut für Technologie, Herrmann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen (Germany).
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