Importance of structural distortions in enhancement of transition temperature in FeSe1 - XTex superconductors

Kapil E. Ingle; K. R. Priolkar; Anand Pal; Rayees A. Zargar; V. P.S. Awana; S. Emura

doi:10.1088/0953-2048/28/1/015015

Importance of structural distortions in enhancement of transition temperature in FeSe_{1 - X}Te_x superconductors

Kapil E. Ingle, K. R. Priolkar, Anand Pal, Rayees A. Zargar, V. P.S. Awana, S. Emura

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11 Citations (Scopus)

Abstract

Temperature (12 K ≤ T ≤ 300 K) dependent extended x-ray absorption fine structure (EXAFS) studies at the Fe K edge in FeSe_1-xTe_x (x = 0, 0.5 and 1.0) compounds have been carried out to understand the reasons for the increase in TC upon Te doping in FeSe. While local distortions are present near superconducting onset in FeSe and FeSe_0.5Te_0.5, they seem to be absent in non superconducting FeTe. Of crucial importance is the variation of anion height. In FeSe_0.5Te_0.5, near the superconducting onset, the two heights, - h_{Fe Se} and - h_{Fe Te} show a nearly opposite behaviour. These changes indicate a possible correlation between Fe-chalcogen hybridization and the superconducting transition temperature in these Fe-chalcogenides.

Original language	English
Article number	015015
Journal	Superconductor Science and Technology
Volume	28
Issue number	1
DOIs	https://doi.org/10.1088/0953-2048/28/1/015015
Publication status	Published - 01-01-2015

All Science Journal Classification (ASJC) codes

Ceramics and Composites
Condensed Matter Physics
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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10.1088/0953-2048/28/1/015015

Cite this

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title = "Importance of structural distortions in enhancement of transition temperature in FeSe1 - XTex superconductors",

abstract = "Temperature (12 K ≤ T ≤ 300 K) dependent extended x-ray absorption fine structure (EXAFS) studies at the Fe K edge in FeSe1-xTex (x = 0, 0.5 and 1.0) compounds have been carried out to understand the reasons for the increase in TC upon Te doping in FeSe. While local distortions are present near superconducting onset in FeSe and FeSe0.5Te0.5, they seem to be absent in non superconducting FeTe. Of crucial importance is the variation of anion height. In FeSe0.5Te0.5, near the superconducting onset, the two heights, - hFe Se and - hFe Te show a nearly opposite behaviour. These changes indicate a possible correlation between Fe-chalcogen hybridization and the superconducting transition temperature in these Fe-chalcogenides.",

author = "Ingle, {Kapil E.} and Priolkar, {K. R.} and Anand Pal and Zargar, {Rayees A.} and Awana, {V. P.S.} and S. Emura",

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AU - Ingle, Kapil E.

AU - Priolkar, K. R.

AU - Pal, Anand

AU - Zargar, Rayees A.

AU - Awana, V. P.S.

AU - Emura, S.

PY - 2015/1/1

Y1 - 2015/1/1

N2 - Temperature (12 K ≤ T ≤ 300 K) dependent extended x-ray absorption fine structure (EXAFS) studies at the Fe K edge in FeSe1-xTex (x = 0, 0.5 and 1.0) compounds have been carried out to understand the reasons for the increase in TC upon Te doping in FeSe. While local distortions are present near superconducting onset in FeSe and FeSe0.5Te0.5, they seem to be absent in non superconducting FeTe. Of crucial importance is the variation of anion height. In FeSe0.5Te0.5, near the superconducting onset, the two heights, - hFe Se and - hFe Te show a nearly opposite behaviour. These changes indicate a possible correlation between Fe-chalcogen hybridization and the superconducting transition temperature in these Fe-chalcogenides.

AB - Temperature (12 K ≤ T ≤ 300 K) dependent extended x-ray absorption fine structure (EXAFS) studies at the Fe K edge in FeSe1-xTex (x = 0, 0.5 and 1.0) compounds have been carried out to understand the reasons for the increase in TC upon Te doping in FeSe. While local distortions are present near superconducting onset in FeSe and FeSe0.5Te0.5, they seem to be absent in non superconducting FeTe. Of crucial importance is the variation of anion height. In FeSe0.5Te0.5, near the superconducting onset, the two heights, - hFe Se and - hFe Te show a nearly opposite behaviour. These changes indicate a possible correlation between Fe-chalcogen hybridization and the superconducting transition temperature in these Fe-chalcogenides.

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Importance of structural distortions in enhancement of transition temperature in FeSe_{1 - X}Te_x superconductors

Abstract

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