Strong enhancement of superconductivity in inorganic electride 12CaO·7Al2O3:e?/sup> under high pressure

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• 作者：Shigeki Tanaka (1)
  Tomoki Kato (1)
  Atsushi Miyake (1)
  Tomoko Kagayama (1)
  Katsuya Shimizu (1)
  Sung Wng Kim (2)
  Satoru Matsuishi (3)
  Hideo Hosono (2) (3)
  
• 关键词：12CaO·7Al2O3 ; e? ; Electride ; Superconductivity ; Pressure effect
• 刊名：Journal of the Korean Physical Society
• 出版年：2013
• 出版时间：August 2013
• 年：2013
• 卷：63
• 期：3
• 页码：477-480
• 全文大小：201KB
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• 作者单位：Shigeki Tanaka (1)
  Tomoki Kato (1)
  Atsushi Miyake (1)
  Tomoko Kagayama (1)
  Katsuya Shimizu (1)
  Sung Wng Kim (2)
  Satoru Matsuishi (3)
  Hideo Hosono (2) (3)
  
  1. KYOKUGEN, Osaka University, Toyonaka Osaka, 560-8531, Japan
  2. Frontier Research Center, Tokyo Institute of Technology, Yokohama Kanagawa, 225-8503, Japan
  3. Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama Kanagawa, 226-8503, Japan
  
• ISSN：1976-8524

文摘

We present the results of the pressure dependence of the superconductivity of the inorganic electride 12CaO·7Al2O3:e?/sup> (C12A7:e?/sup>) single crystal through the ac-susceptibility measurement under high pressure. C12A7:e?/sup> has the cage structure and the density of states derived from the cages may play an important role in the superconductivity. The superconducting transition temperature (T c) is ?0.2 K at ambient pressure and monotonically increases up to 1.79 K at 4.7 GPa. The upper critical field H c2 and ?em class="a-plus-plus">dH c2/dT at T c, in proportion to the density of states (DOS) at Fermi energy becomes larger under high pressure. The superconductivity in C12A7:e?/sup> is mediated by the electron-phonon interaction, and the increase of Tc with pressure may arise from a peak structure of the DOS of cage conduction band.