Suppression of superconductivity in Fe chalcogenides by annealing: A reverse effect to pressure

TitleSuppression of superconductivity in Fe chalcogenides by annealing: A reverse effect to pressure
Publication TypeJournal Article
Year of Publication2011
AuthorsLouca D, Yan JQ, Llobet A, Arita R
Journal TitlePhysical Review B
Volume84
Pages054522
Date Published08
ISBN Number1098-0121
Accession NumberWOS:000293729000011
Abstract

Superconductivity in FeTe(1-x)Se(x) can be controlled by annealing in the absence of extrinsic influences. Using neutron diffraction, we show that the superconducting transition temperature (T(C)) sensitively depends on the atomic configurations of the Te and Se ions. Low-temperature annealing not only homogenizes the Te and Se ion distribution, it suppresses T(C) because of changes in the chalcogen ion's z parameter. In particular, the height of Te from the Fe basal plane is much reduced while that for Se shows a modest increase. These trends are the reverse of the effects induced by pressure.

DOI10.1103/PhysRevB.84.054522