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Communication

Superconductivity in an Inorganic Electride 12CaO·7Al₂O₃:e^-

Supporting Info

Masashi Miyakawa,^† Sung Wng Kim,^† Masahiro Hirano,^† Yoshimitsu Kohama,^‡ Hitoshi Kawaji,^‡ Tooru Atake,^‡ Hiroki Ikegami,^§ Kimitoshi Kono,^§ and Hideo Hosono*^†^‡

Frontier Collaborative Research Center, Tokyo Institute of Technology, Mail Box S2-13, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, Materials and Structures Laboratory, Tokyo Institute of Technology, Mail Box R3-7, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, and Low Temperature Physics Laboratory, RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198, Japan

J. Am. Chem. Soc., 2007, 129 (23), pp 7270–7271

DOI: 10.1021/ja0724644

Publication Date (Web): May 22, 2007

†

Frontier Collaborative Research Center, Tokyo Institute of Technology.

‡

Materials and Structures Laboratory, Tokyo Institute of Technology.

Low Temperature Physics Laboratory, RIKEN.

In papers with more than one author, the asterisk indicates the name of the author to whom inquiries about the paper should be addressed.

, hosono@msl.titech.ac.jp

Abstract

An inorganic electride, 12CaO·7Al₂O₃:e^-, synthesized by exclusively replacing oxygen ions in the sub-nanometer-sized cages of 12CaO·7Al₂O₃ crystal with electrons exhibits a superconducting transition at a temperature (T_c) of 0.4 K. T_c varies in the range of 0.14−0.4 K with the concentration of anionic electrons, which are primarily distributed over crystallographic spaces without occupying any particular framework ions. The precursor of electride is composed of representative metal oxides, which are electrical insulators. Thus, the exotic crystal structure of electrides provides an insight for a material platform to realize a new superconductor.