Superconducting gap and symmetry in FeSe1-XTex studied by specifi c heat in magnetic fields

Takuya Konno, Tadashi Adachi, Masato Imaizumi, Takashi Noji, Takayuki Kawamata, Yoji Koike

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2 Citations (Scopus)

Abstract

In order to investigate details of the superconducting (SC) gap in the iron-chalcogenide superconductors, the specific heat, C , of FeSe1-x Tex with x = 0.6 -1 has been measured in magnetic fields. Using the two-gap model, it has been found that the smaller SC gap is significantly depressed by the application of magnetic field, resulting in the increase of the slope of the C/T vs T 2 plot at low temperatures. From the specific-heat measurements at very low temperatures down to 0.4 K, it has been found that the enhancement of the residual electronic-specific-heat-coefficient in the ground state, £0, by the application of magnetic field is much smaller than that expected for superconductors with the typical s- or d-wave SC paring symmetry, which is in sharp contrast to the significant enhancement of £0 observed in the iron-pnictide superconductors. These results are discussed in relation to the multi-band effect in the iron-based superconductors.

Original languageEnglish
Article number094721
Journaljournal of the physical society of japan
Volume83
Issue number9
DOIs
Publication statusPublished - 2014 Sep 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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