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Fujioka M, Ishimaru M, Shibuya T, Kamihara Y, Tabata C, Amitsuka H, Miura A, Tanaka M, Takano Y, Kaiju H, Nishii J. Discovery of the Pt-Based Superconductor LaPt5As. J Am Chem Soc 2016; 138:9927-34. [PMID: 27461965 DOI: 10.1021/jacs.6b04976] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A novel superconductor, LaPt5As, which exhibits a new crystal structure was discovered by high-pressure synthesis using a Kawai-type apparatus. A superconducting transition temperature was observed at 2.6 K. Depending on the sintering pressure, LaPt5As has superconducting and non-superconducting phases with different crystal structures. A sintering pressure of around 10 GPa is effective to form single-phase superconducting LaPt5As. This material has a very unique crystal structure with an extremely long c lattice parameter of over 60 Å and corner-sharing tetrahedrons composed of network-like Pt layers. Density functional theory calculations have suggested that the superconducting current flows through these Pt layers. Also, this unique layered structure characteristic of LaPt5As is thought to play a key role in the emergence of superconductivity. Furthermore, due to a stacking structure which makes up layers, various structural modifications for the LaPt5As family are conceivable. Since such a high-pressure synthesis using a Kawai-type apparatus is not common in the field of materials science, there is large room for further exploration of unknown phases which are induced by high pressure in various materials.
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Affiliation(s)
- Masaya Fujioka
- Research Institute for Electronic Science, Hokkaido University , Sapporo, Hokkaido 001-0020, Japan
| | - Manabu Ishimaru
- Department of Materials Science and Engineering, Kyushu Institute of Technology , Tobata, Kitakyushu, Fukuoka 804-8550, Japan
| | - Taizo Shibuya
- IoT Devices Research Laboratories, NEC Corporation , Tsukuba, Ibaraki 305-8501, Japan
| | - Yoichi Kamihara
- Department of Applied Physics and Physico-Informatics, Faculty of Science and Technology, Keio University , Yokohama, Kanagawa 223-8522, Japan
| | - Chihiro Tabata
- Graduate School of Science, Hokkaido University , Sapporo, Hokkaido 060-0810, Japan
| | - Hiroshi Amitsuka
- Graduate School of Science, Hokkaido University , Sapporo, Hokkaido 060-0810, Japan
| | - Akira Miura
- Faculty of Engineering, Hokkaido University , Sapporo, Hokkaido 060-8628, Japan
| | - Masashi Tanaka
- MANA, National Institute for Materials Science , 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Yoshihiko Takano
- MANA, National Institute for Materials Science , 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Hideo Kaiju
- Research Institute for Electronic Science, Hokkaido University , Sapporo, Hokkaido 001-0020, Japan
| | - Junji Nishii
- Research Institute for Electronic Science, Hokkaido University , Sapporo, Hokkaido 001-0020, Japan
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Tominez E, Alleno E, Berger P, Bohn M, Mazumdar C, Godart C. Chemical and Superconducting Properties of the Quaternary Borocarbides Ln–M–B–C (Ln=rare earths, Y; M=Ni, Pd). J SOLID STATE CHEM 2000. [DOI: 10.1006/jssc.2000.8821] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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