TY - JOUR
T1 - Suppression of superconductivity in Fe chalcogenides by annealing
T2 - A reverse effect to pressure
AU - Louca, Despina
AU - Yan, Jiaqiang
AU - Llobet, Anna
AU - Arita, Ryotaro
PY - 2011/8/10
Y1 - 2011/8/10
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=80052358292&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.84.054522
DO - 10.1103/PhysRevB.84.054522
M3 - Article
AN - SCOPUS:80052358292
SN - 1098-0121
VL - 84
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 5
M1 - 054522
ER -