TY - JOUR
T1 - Exceptional suppression of flux-flow resistivity in FeSe0.4Te0.6 by back-flow from excess Fe atoms and Se/Te substitutions
AU - Okada, Tatsunori
AU - Nabeshima, Fuyuki
AU - Takahashi, Hideyuki
AU - Imai, Yoshinori
AU - Maeda, Atsutaka
N1 - Publisher Copyright:
© 2015 American Physical Society.
PY - 2015/2/11
Y1 - 2015/2/11
N2 - We measured the microwave surface impedance of FeSe0.4Te0.6 single crystals with and without external magnetic fields. The superfluid density exhibited a quadratic temperature dependence, indicating a strong pair-breaking effect. The flux-flow resistivity behaved as ρf(B<Bc2)/ρn=αB/Bc2. The observed α value of ≈0.66 was considerably smaller than that of other Fe-based materials (α≥1) and was attributed to a back-flow of superfluids remarkable in disordered superconductors. This is an observation of the back-flow phenomenon caused by an origin other than the vortex pinning in multiple-band systems.
AB - We measured the microwave surface impedance of FeSe0.4Te0.6 single crystals with and without external magnetic fields. The superfluid density exhibited a quadratic temperature dependence, indicating a strong pair-breaking effect. The flux-flow resistivity behaved as ρf(B<Bc2)/ρn=αB/Bc2. The observed α value of ≈0.66 was considerably smaller than that of other Fe-based materials (α≥1) and was attributed to a back-flow of superfluids remarkable in disordered superconductors. This is an observation of the back-flow phenomenon caused by an origin other than the vortex pinning in multiple-band systems.
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U2 - 10.1103/PhysRevB.91.054510
DO - 10.1103/PhysRevB.91.054510
M3 - Article
AN - SCOPUS:84922566806
SN - 1098-0121
VL - 91
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 5
M1 - 054510
ER -