Specific heat in magnetic fields and superconducting gap structure in FeSe1-xTex (0.6 ≤ x ≤ 1)

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

doi:10.1016/j.physc.2014.04.019

Specific heat in magnetic fields and superconducting gap structure in FeSe_1-xTe_x (0.6 ≤ x ≤ 1)

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

ENG - Applied Physics

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

Specific heat has been measured in magnetic fields at low temperatures down to 0.4 K in the iron-chalcogenide superconductors of FeSe_1- _xTe_x, in order to investigate details of the superconducting (SC) gap. Using the two-gap model, it has been found that the smaller SC gap is significantly depressed by the application of magnetic field. Moreover, it has been found that the enhancement of the residual electronic-specific-heat-coefficient in the ground state by the application of magnetic field is much smaller than that expected for superconductors with the typical s-wave or d-wave SC paring symmetry. These results are discussed in relation to the multi-band effect in the iron-based superconductors.

Original language	English
Pages (from-to)	16-18
Number of pages	3
Journal	Physica C: Superconductivity and its applications
Volume	504
DOIs	https://doi.org/10.1016/j.physc.2014.04.019
Publication status	Published - 2014 Sept 15

Keywords

Iron-chalcogenide superconductor
Specific heat in magnetic fields
Superconducting gap

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1016/j.physc.2014.04.019

Cite this

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title = "Specific heat in magnetic fields and superconducting gap structure in FeSe1-xTex (0.6 ≤ x ≤ 1)",

abstract = "Specific heat has been measured in magnetic fields at low temperatures down to 0.4 K in the iron-chalcogenide superconductors of FeSe1- xTex, in order to investigate details of the superconducting (SC) gap. Using the two-gap model, it has been found that the smaller SC gap is significantly depressed by the application of magnetic field. Moreover, it has been found that the enhancement of the residual electronic-specific-heat-coefficient in the ground state by the application of magnetic field is much smaller than that expected for superconductors with the typical s-wave or d-wave SC paring symmetry. These results are discussed in relation to the multi-band effect in the iron-based superconductors.",

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T1 - Specific heat in magnetic fields and superconducting gap structure in FeSe1-xTex (0.6 ≤ x ≤ 1)

AU - Konno, Takuya

AU - Adachi, Tadashi

AU - Imaizumi, Masato

AU - Noji, Takashi

AU - Kawamata, Takayuki

AU - Koike, Yoji

PY - 2014/9/15

Y1 - 2014/9/15

N2 - Specific heat has been measured in magnetic fields at low temperatures down to 0.4 K in the iron-chalcogenide superconductors of FeSe1- xTex, in order to investigate details of the superconducting (SC) gap. Using the two-gap model, it has been found that the smaller SC gap is significantly depressed by the application of magnetic field. Moreover, it has been found that the enhancement of the residual electronic-specific-heat-coefficient in the ground state by the application of magnetic field is much smaller than that expected for superconductors with the typical s-wave or d-wave SC paring symmetry. These results are discussed in relation to the multi-band effect in the iron-based superconductors.

AB - Specific heat has been measured in magnetic fields at low temperatures down to 0.4 K in the iron-chalcogenide superconductors of FeSe1- xTex, in order to investigate details of the superconducting (SC) gap. Using the two-gap model, it has been found that the smaller SC gap is significantly depressed by the application of magnetic field. Moreover, it has been found that the enhancement of the residual electronic-specific-heat-coefficient in the ground state by the application of magnetic field is much smaller than that expected for superconductors with the typical s-wave or d-wave SC paring symmetry. These results are discussed in relation to the multi-band effect in the iron-based superconductors.

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