Pressure-induced high- Tc superconducting phase in FeSe: Correlation between anion height and Tc

H. Okabe, N. Takeshita, K. Horigane, T. Muranaka, J. Akimitsu

Research output: Contribution to journalArticlepeer-review

131 Citations (Scopus)

Abstract

In this study, we performed high-pressure electrical resistivity measurements of polycrystalline FeSe in the pressure range of 1-16.0 GPa at temperatures of 4-300 K. A precise evaluation of Tc from zero-resistivity temperatures revealed that Tc shows a slightly distorted dome-shaped curve with maximum Tc offset (30 K) at 6 GPa. With the application of pressure, the temperature dependence of resistivity above Tc changes dramatically to a linear dependence, that the high- Tc phase appears above 3 GPa. We found a striking correlation between Tc and the Se height: the lower the Se height, the more enhanced is Tc. Moreover, this relation is broadly applicable to other iron pnictides, strongly indicating that high-temperature superconductivity can appear only around the optimum anion height (∼1.38Å). On the basis of these results, we suggest that the anion height should be considered as a key determining factor of Tc of iron-based superconductors containing various anions.

Original languageEnglish
Article number205119
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number20
DOIs
Publication statusPublished - May 24 2010
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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