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

Ingle, Kapil E and Priolkar, KR and Pal, Anand and Zargar, Rayees A and Awana, VPS and Emura, S (2015) Importance of structural distortions in enhancement of transition temperature in FeSe1-xTex superconductors. In: SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 28 (1).

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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 T-C 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, 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.

Item Type:	Journal Article
Publication:	SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Publisher:	IOP PUBLISHING LTD
Additional Information:	Copy right for this article belongs to the IOP PUBLISHING LTD, TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
Keywords:	superconductivity; EXAFS; iron based superconductors
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	24 Apr 2015 06:21
Last Modified:	24 Apr 2015 06:21
URI:	http://eprints.iisc.ac.in/id/eprint/51408

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