Superconducting properties of a stoichiometric FeSe compound and two anomalous features in the normal state

Yoo Jang Song, Jong Beom Hong, Byeong Hun Min, Yong Seung Kwon, Kyu Jun Lee, Myung Hwa Jung, Jong Soo Rhyee

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

This paper reports the superconducting behavior of the tetragonal iron-chalcogenide superconductor FeSe. The electrical resistivity and the magnetic moment measurements confirmed its superconductivity with Tzero c and Tmag c of 9.4 K under ambient pressure. Electron probe macro analysis indicated that the sample had a stoichiometric Fe:Se ratio of 1:1. The Seebeck coefficient, which was 12.3 μV/K at room temperature, changed to a negative value near 200 K, indicating it to be a two-carrier material. Above Tc, the ρ(T) curve revealed an 'S' shape, and dρ(T)/dT and d2ρ(T)/dT2 showed two anomalous features, one near Tan = 30 K and the other near T* = 110 K. The Seebeck coefficient, S(T), also displays peculiar behavior near the Tan and T*. We also report a rather smaller critical current density, Jc = 102 ~ 104 A/cm2, compared to those observed for the other pnictides and doped chalcogenides.

Original languageEnglish
Pages (from-to)312-316
Number of pages5
JournalJournal of the Korean Physical Society
Volume59
Issue number2
DOIs
StatePublished - 12 Aug 2011

Keywords

  • Critical current density
  • Pseudogap
  • Seebeck coefficient
  • Superconductivity

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