Weak superconducting fluctuations and small anisotropy of the upper critical fields in an Fe1.05Te0.85Se0.15 single crystal

Abstract

We have investigated the temperature dependence of the resistive upper critical fields (${\mu }_0{H}_{c2}(T)$) for an Fe${}_{1.05}$Te${}_{0.85}$Se${}_{0.15}$ single crystal, which exhibit superconductivity at $T_{\mathrm{c}}\sim 14K,inmagneticfieldsofupto55T.Two-dimensionalfeatureandsuperconductingfluctuationsofthesamplesarefoundtobeweak,becausetheresistivebroadeningeffectonappliedmagneticfieldsofupto14Tissmall.ThePauliparamagneticeffectisobviouslyevidencedbythestrongsuppressionofthe$μ_{0}H_{\rm c2}^{ab}(T)$($H \parallel ab$)curveandnearlyisotropic$μ_{0}H_{\rm c2}(0) \approx 47 T is seen for both $H\parallel ab$ and $H\parallel c$. This fact is almost identical to the results of Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$ single crystals reported previously. We have discussed that the small anisotropy of the upper critical field at low temperatures in Fe${}_{1+y}$(Te,Se) systems against the variation of the Te/Se ratio.

arXiv comment10 pages, 4 figures

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• Superconductivity in oxygen-annealed FeTe1-xSx single crystal
• Superconductivity in PbO-type Fe chalcogenides
• Effect of Co Impurities on Superconductivity of FeSe0.4Te0.6 single crystals
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• Investigation of Transport Properties for FeSe${}_{1-x}$Te${}_x$ Thin Films under Magnetic Fields
• Intrinsic pinning by naturally occurring correlated defects in FeSe${}_{\text{1-x}}$Te${}_{\text{x}}$ superconductors
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• Evolution of tetragonal phase in the FeSe wire fabricated by a novel chemical-transformation PIT process