J. Phys. Soc. Jpn. 78, 074712 (2009) [5 Pages]
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Received November 17, 2008; Accepted May 7, 2009; Published July 10, 2009
We have investigated the effect of atomic substitutions in the FeSe system, which exhibits the simplest crystal structure among the iron-based superconductors. An enhancement of the superconducting transition temperature T c was observed with the substitution of S or Te for Se; the T c increased with S substitution by up to 20%, and also increased with Te substitution up to 75%. In contrast, Co or Ni substitutions for the Fe site significantly suppressed superconductivity. In this work we present a detailed description of the substitution technique employed to determine T c in the FeSe system.
©2009 The Physical Society of Japan
KEYWORDS: FeSe, iron-based superconductor, superconductivity, substitution effect, chemical pressure
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