Importance of structural distortions in enhancement of transition temperature in FeSeTe superconductors
arXiv:1410.6561 · doi:10.1088/0953-2048/28/1/015015
Abstract
Temperature (12K T 300K) dependent extended X-ray absorption fine structure (EXAFS) studies at the Fe K edge in FeSeTe (x = 0, 0.5 and 1.0) compounds have been carried out to understand the reasons for increase in T upon Te doping in FeSe. While local distortions are present near superconducting onset in FeSe and FeSeTe, they seem to be absent in non superconducting FeTe. Of crucial importance is the variation of anion height. In FeSeTe, near superconducting onset, the two heights, and show a nearly opposite behaviour. These changes indicate a possible correlation between Fe-chalcogen hybridization and the superconducting transition temperature in these Fe-chalcogenides.
arXiv commentAccepted for publication in Superconductor Science and Technology
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