Discovery of the Pt-Based Superconductor LaPt5As

Masaya Fujioka, Manabu Ishimaru, Taizo Shibuya, Yoichi Kamihara, Chihiro Tabata, Hiroshi Amitsuka, Akira Miura, Masashi Tanaka, Yoshihiko Takano, Hideo Kaiju, Junji Nishii

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5 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)9927-9934
Number of pages8
JournalJournal of the American Chemical Society
Volume138
Issue number31
DOIs
Publication statusPublished - 2016 Aug 10

ASJC Scopus subject areas

  • Catalysis
  • Biochemistry
  • Chemistry(all)
  • Colloid and Surface Chemistry

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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. (2016). Discovery of the Pt-Based Superconductor LaPt5As. Journal of the American Chemical Society, 138(31), 9927-9934. https://doi.org/10.1021/jacs.6b04976