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Zhu Q, Xiao G, Yang W, Song S, Cao GH, Ren Z. Mo 3ReRuC: A Noncentrosymmetric Superconductor Formed in the MoReRu-Mo 2C System. Inorg Chem 2022; 61:17115-17122. [PMID: 36256887 DOI: 10.1021/acs.inorgchem.2c02592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A quaternary compound with the composition Mo3ReRuC is obtained in a previously unexplored MoReRu-Mo2C system. According to X-ray structural analysis, Mo3ReRuC crystallizes in the noncentrosymmetric space group P4132 [cubic β-Mn-type structure, a = 6.8107(1) Å]. Below 7.7 K, Mo3ReRuC becomes a bulk type-II superconductor with an upper critical field close to the Pauli paramagnetic limit. The specific heat data give a large normalized jump ΔCp/γTc = 2.3 at Tc, which points to a strongly coupled superconducting state. First-principles calculations show that its electronic states at the Fermi level are mainly contributed by Mo, Re, and Ru atoms and strongly increased by the spin-orbit coupling. Our finding suggests that the intermediate phase between alloys and carbides may be a good place to look for β-Mn-type noncentrosymmetric superconductors.
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Affiliation(s)
- Qinqing Zhu
- Ningbo Institute of Technology, Beihang University, 399 Kangda Road, Beilun District, Ningbo315000, P. R. China.,Department of Physics, School of Science, Westlake University, 18 Shilongshan Road, Hangzhou310024, P. R. China.,Institute of Natural Sciences, Westlake Institute for Advanced Study, 18 Shilongshan Road, Hangzhou310024, P. R. China
| | - Guorui Xiao
- Department of Physics, School of Science, Westlake University, 18 Shilongshan Road, Hangzhou310024, P. R. China.,Institute of Natural Sciences, Westlake Institute for Advanced Study, 18 Shilongshan Road, Hangzhou310024, P. R. China.,School of Physics, Zhejiang University, Hangzhou310058, P. R. China
| | - Wuzhang Yang
- Department of Physics, School of Science, Westlake University, 18 Shilongshan Road, Hangzhou310024, P. R. China.,Institute of Natural Sciences, Westlake Institute for Advanced Study, 18 Shilongshan Road, Hangzhou310024, P. R. China.,Department of Physics, Fudan University, Shanghai200433, P. R. China
| | - Shijie Song
- School of Physics, Zhejiang University, Hangzhou310058, P. R. China
| | - Guang-Han Cao
- School of Physics, Zhejiang University, Hangzhou310058, P. R. China
| | - Zhi Ren
- Department of Physics, School of Science, Westlake University, 18 Shilongshan Road, Hangzhou310024, P. R. China.,Institute of Natural Sciences, Westlake Institute for Advanced Study, 18 Shilongshan Road, Hangzhou310024, P. R. China
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Burkhardt U, Winkelmann A, Borrmann H, Dumitriu A, König M, Cios G, Grin Y. Assignment of enantiomorphs for the chiral allotrope β-Mn by diffraction methods. SCIENCE ADVANCES 2021; 7:7/20/eabg0868. [PMID: 33990329 PMCID: PMC8121419 DOI: 10.1126/sciadv.abg0868] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Accepted: 03/29/2021] [Indexed: 06/12/2023]
Abstract
The assignment of enantiomorphs by diffraction methods shows fundamental differences for x-rays and electrons. This is particularly evident for the chiral allotrope of β-Mn. While it is not possible to determine the sense of chirality of β-Mn with established x-ray diffraction methods, Kikuchi pattern simulation of the enantiomorphs reveals differences, if dynamical electron diffraction is considered. Quantitative comparison between experimental and simulated Kikuchi patterns allows the spatially resolved assignment of the enantiomorph in polycrystalline materials of β-Mn, as well as the structurally strongly related phase Pt2Cu3B. On the basis of enantiomorph distribution maps, crystals were extracted from enantiopure domains by micropreparation techniques. The x-ray diffraction analyses confirm the assignment of the Kikuchi pattern evaluations for Pt2Cu3B and do not allow to distinguish between the enantiomorphs of β-Mn.
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Affiliation(s)
- Ulrich Burkhardt
- Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany.
| | - Aimo Winkelmann
- Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, 30-059 Kraków, Poland.
| | - Horst Borrmann
- Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany
| | - Andreea Dumitriu
- Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany
| | - Markus König
- Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany
| | - Grzegorz Cios
- Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, 30-059 Kraków, Poland
| | - Yuri Grin
- Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany.
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Zaremba N, Pavlosiuk O, Muts I, Nychyporuk G, Pavlyuk V, Kaczorowski D, Pöttgen R, Zaremba V. LaNiGe with Non‐centrosymmetric LaPtSi Type Structure. Z Anorg Allg Chem 2020. [DOI: 10.1002/zaac.202000317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Nazar Zaremba
- Department of Inorganic Chemistry Ivan Franko National University of Lviv Kyryla and Mephodiya Street 6 79005 Lviv Ukraine
| | - Orest Pavlosiuk
- Institute of Low Temperature and Structure Research Polish Academy of Sciences 50–950 Wroclaw Poland
| | - Ihor Muts
- Department of Inorganic Chemistry Ivan Franko National University of Lviv Kyryla and Mephodiya Street 6 79005 Lviv Ukraine
- Institut für Anorganische und Analytische Chemie Universität Münster Corrensstrasse 30 48149 Münster Germany
| | - Galyna Nychyporuk
- Department of Inorganic Chemistry Ivan Franko National University of Lviv Kyryla and Mephodiya Street 6 79005 Lviv Ukraine
| | - Volodymyr Pavlyuk
- Department of Inorganic Chemistry Ivan Franko National University of Lviv Kyryla and Mephodiya Street 6 79005 Lviv Ukraine
- Institute of Chemistry Jan Dlugosz University in Czestochowa al. Armii Krajowej 13/15 42‐200 Czestochowa Poland
| | - Dariusz Kaczorowski
- Institute of Low Temperature and Structure Research Polish Academy of Sciences 50–950 Wroclaw Poland
| | - Rainer Pöttgen
- Institut für Anorganische und Analytische Chemie Universität Münster Corrensstrasse 30 48149 Münster Germany
| | - Vasyl Zaremba
- Department of Inorganic Chemistry Ivan Franko National University of Lviv Kyryla and Mephodiya Street 6 79005 Lviv Ukraine
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Burkhardt U, Borrmann H, Moll P, Schmidt M, Grin Y, Winkelmann A. Absolute Structure from Scanning Electron Microscopy. Sci Rep 2020; 10:4065. [PMID: 32132558 PMCID: PMC7055257 DOI: 10.1038/s41598-020-59854-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Accepted: 02/04/2020] [Indexed: 11/18/2022] Open
Abstract
The absence of centrosymmetry in chiral and polar crystal structures is the reason for many technical relevant physical properties like optical birefringence or ferroelectricity. Other chirality related properties that are actually intensively investigated are unconventional superconductivity or unusual magnetic ordering like skyrmions in materials with B20 structure. Despite the often close crystal structure - property relation, its detection is often challenging due to superposition of domains with different absolute structure e.g. chirality. Our investigations of high quality CoSi crystals with B20 structure by both complementary methods X- ray (volume sensitive) and electron backscatter diffraction (EBSD) (surface sensitive) results the consistent assignment of the chirality and reveal fundamental differences in their sensitivity to chirality. The analysis of the surface of a CoSi crystal with domains of different chirality show the high spatial resolution of this method which opens the possibility to analyze the chirality in microstructures of technical relevant materials like thin films and catalysts.
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Affiliation(s)
- Ulrich Burkhardt
- Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Germany.
| | - Horst Borrmann
- Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Germany
| | - Philip Moll
- Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Germany.,École polytechnique fédéral de Lausanne, CH-1015, Lausanne, Switzerland
| | - Marcus Schmidt
- Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Germany
| | - Yuri Grin
- Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Germany
| | - Aimo Winkelmann
- Laser Zentrum Hannover e.V, Hannover, Germany.,Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, 30-059, Krakow, Poland
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Idczak R, Sahakyan M, Tran VH. Superconducting-state properties and electronic band structure calculations of a noncentrosymmetric Th 7Ni 3 compound. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:475802. [PMID: 30387439 DOI: 10.1088/1361-648x/aae7be] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Superconducting-state properties of a noncentrosymmetric Th7Ni3 compound have been investigated using magnetic, electrical resistivity and specific heat measurements as well as by electronic band structure calculations. The study reveals that the studied compound is a dirty type-II superconductor with [Formula: see text] K and a weak electron-phonon coupling [Formula: see text]. Moreover, in contrast to an exotic superconductivity observed previously in Th7Fe3 and Th7Co3, data reported in this paper give clear evidence that Th7Ni3 is a conventional single-gap superconductor. The experimental results are supported by DFT calculations of the electronic band structure, density of states, electron localization functions and Fermi surfaces which were performed using the full-potential linear muffin-tin-orbital and full-potential linearized augmented plane wave methods. Theoretical data show that asymmetric spin-orbit coupling in Th7Ni3 is quite small; hence the electronic band structure of this compound is weakly affected by the spin-orbit effects. We have determined fundamental parameters of Th7Ni3 and compared the superconducting properties with other Th7T3 (T = Fe, Co and Ru) compounds.
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Višić B, Panchakarla LS, Tenne R. Inorganic Nanotubes and Fullerene-like Nanoparticles at the Crossroads between Solid-State Chemistry and Nanotechnology. J Am Chem Soc 2017; 139:12865-12878. [DOI: 10.1021/jacs.7b01652] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Bojana Višić
- Department
of Materials and Interfaces, Weizmann Institute, Rehovot 76100, Israel
| | | | - Reshef Tenne
- Department
of Materials and Interfaces, Weizmann Institute, Rehovot 76100, Israel
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Sankar R, Rao GN, Muthuselvam IP, Chang TR, Jeng HT, Murugan GS, Lee WL, Chou FC. Anisotropic superconducting property studies of single crystal PbTaSe 2. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:095601. [PMID: 28098075 DOI: 10.1088/1361-648x/aa4edb] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The anisotropic superconducting properties of PbTaSe2 single crystal is reported. Superconductivity with T c = 3.83 ± 0.02 K has been characterized fully with electrical resistivity ρ(T), magnetic susceptibility χ(T), and specific heat C p (T) measurements using single crystal samples. The superconductivity is type-II with lower critical field H c1 and upper critical field H c2 of 65 and 450 Oe (H⊥ to the ab-plane), 140 and 1500 Oe (H|| to the ab-plane), respectively. These results indicate that the superconductivity of PbTaSe2 is anisotropic. The superconducting anisotropy, electron-phonon coupling λ ep, superconducting energy gap Δ0, and the specific heat jump ΔC/γT c at T c confirms that PbTaSe2 can be categorized as a bulk superconductor.
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Affiliation(s)
- Raman Sankar
- Institute of Physics, Academia Sinica, Taipei 11529, Taiwan. Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
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Paul GC, Dutta P, Saha A. Transport and noise properties of a normal metal-superconductor-normal metal junction with mixed singlet and chiral triplet pairings. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:015301. [PMID: 27830661 DOI: 10.1088/0953-8984/29/1/015301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We study transport and zero frequency shot noise properties of a normal metal-superconductor-normal metal (NSN) junction, with the superconductor having mixed singlet and chiral triplet pairings. We show that in the subgapped regime when the chiral triplet pairing amplitude dominates over that of the singlet, a resonance phenomena emerges out at zero energy where all the quantum mechanical scattering probabilities acquire a value of 0.25. At the resonance, crossed Andreev reflection mediating through such junction, acquires a zero energy peak. This reflects as a zero energy peak in the conductance as well depending on the doping concentration. We also investigate shot noise for this system and show that shot noise cross-correlation is negative in the subgapped regime when the triplet pairing dominates over the singlet one. The latter is in sharp contrast to the positive shot noise obtained when the singlet pairing is the dominating one.
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Ahn K, Kremer RK, Simon A, Marshall WG, Muñoz A. Pressure-structure relationships in the 10 K layered carbide halide superconductor Y2C2I2. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:375703. [PMID: 27420394 DOI: 10.1088/0953-8984/28/37/375703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The electronic structures of the 10 K layered yttrium carbide halide superconductor Y2C2I2 is characterized by bands of low dispersion and narrow peak-valley features in the electronic density of states at the Fermi level. In order to investigate to what extent the superconducting properties can be modified by external pressure we have studied the pressure dependence of the superconducting critical temperature and the crystal structure of Y2C2I2 to pressures of 7.4 GPa. Up to ~2.5 GPa we observe an increase of T c from 10 K to about 12 K. A structural phase transition from a 1s to a 3s stacking variant occurs at about 2.5 GPa above which T c rapidly decreases to a value of ~7.5 K at 7.5 GPa. Density functional calculations corroborate the structural phase transition to occur at a critical cell volume of ~270 Å(3) corresponding to a pressure of ~2.4 GPa, in good agreement with the experimental findings. The pressure dependence of T c and inter-atomic distances and angles are discussed with respect to the results of density functional calculations of the electronic and crystal structure.
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Affiliation(s)
- Kyungsoo Ahn
- Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany. Department of Chemistry, Yonsei University, Wonju 220-710, Korea
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Subbarao U, Rayaprol S, Dally R, Graf MJ, Peter SC. Swinging Symmetry, Multiple Structural Phase Transitions, and Versatile Physical Properties in RECuGa3 (RE = La-Nd, Sm-Gd). Inorg Chem 2016; 55:666-75. [PMID: 26717270 DOI: 10.1021/acs.inorgchem.5b02023] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The compounds RECuGa3 (RE = La-Nd, Sm-Gd) were synthesized by various techniques. Preliminary X-ray diffraction (XRD) analyses at room temperature suggested that the compounds crystallize in the tetragonal system with either the centrosymmetric space group I4/mmm (BaAl4 type) or the non-centrosymmetric space group I4mm (BaNiSn3 type). Detailed single-crystal XRD, neutron diffraction, and synchrotron XRD studies of selected compounds confirmed the non-centrosymmetric BaNiSn3 structure type at room temperature with space group I4mm. Temperature-dependent single-crystal XRD, powder XRD, and synchrotron beamline measurements showed a structural transition between centro- and non-centrosymmetry followed by a phase transition to the Rb5Hg19 type (space group I4/m) above 400 K and another transition to the Cu3Au structure type (space group Pm3̅m) above 700 K. Combined single-crystal and synchrotron powder XRD studies of PrCuGa3 at high temperatures revealed structural transitions at higher temperatures, highlighting the closeness of the BaNiSn3 structure to other structure types not known to the RECuGa3 family. The crystal structure of RECuGa3 is composed of eight capped hexagonal prism cages [RE4Cu4Ga12] occupying one rare-earth atom in each ring, which are shared through the edge of Cu and Ga atoms along the ab plane, resulting in a three-dimensional network. Resistivity and magnetization measurements demonstrated that all of these compounds undergo magnetic ordering at temperatures between 1.8 and 80 K, apart from the Pr and La compounds: the former remains paramagnetic down to 0.3 K, while superconductivity was observed in the La compound at T = 1 K. It is not clear whether this is intrinsic or due to filamentary Ga present in the sample. The divalent nature of Eu in EuCuGa3 was confirmed by magnetization measurements and X-ray absorption near edge spectroscopy and is further supported by the crystal structure analysis.
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Affiliation(s)
- Udumula Subbarao
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research , Jakkur, Bangalore 560064, India
| | - Sudhindra Rayaprol
- UGC-DAE Consortium for Scientific Research , R-5 Shed, B.A.R.C Campus, Trombay, Mumbai 400085, India
| | - Rebecca Dally
- Department of Physics, Boston College , Chestnut Hill, Massachusetts 02467, United States
| | - Michael J Graf
- Department of Physics, Boston College , Chestnut Hill, Massachusetts 02467, United States
| | - Sebastian C Peter
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research , Jakkur, Bangalore 560064, India
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