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

Despina Louca; Jiaqiang Yan; Anna Llobet; Ryotaro Arita

doi:10.1103/PhysRevB.84.054522

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

Despina Louca, Jiaqiang Yan, Anna Llobet, Ryotaro Arita

DOI 10.1103/PhysRevB.84.054522 · Physical Review B

T1

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Abstract

Superconductivity in FeTe1−xSex can be controlled by annealing in the absence of extrinsic influences. Using neutron diffraction, we show that the superconducting transition temperature (TC) 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 TC 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
FeSe0.5Te0.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	14	Pressure not reported	onset
FeSe0.5Te0.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	14	Pressure not reported	onset
FeSe0.48Te0.52 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown