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

T. Kida; M. Kotani; Y. Mizuguchi; Y. Takano; M. Hagiwara

doi:10.1143/JPSJ.79.074706

paper

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

arXiv:1003.1171 · doi:10.1143/JPSJ.79.074706

Abstract

We have investigated the temperature dependence of the resistive upper critical fields ( $μ_{0} H_{c2} (T)$ ) for an Fe $_{1.05}$ Te $_{0.85}$ Se $_{0.15}$ single crystal, which exhibit superconductivity at $T_{c} \sim 14 K, inma g n e t i c f i e l d so f u pt o 55 T . T w o - d im e n s i o na l f e a t u r e an d s u p er co n d u c t in g f l u c t u a t i o n so f t h es am pl es a r e f o u n d t o b e w e ak, b ec a u se t h er es i s t i v e b r o a d e nin g e f f ec t o na ppl i e d ma g n e t i c f i e l d so f u pt o 14 T i ss ma l l . T h e P a u l i p a r ama g n e t i ce f f ec t i so b v i o u s l y e v i d e n ce d b y t h es t r o n g s u pp r ess i o n o f t h e$ μ_{0}H_{\rm c2}^{ab}(T) $($ H \parallel ab $) c u r v e an d n e a r l y i so t r o p i c$ μ_{0}H_{\rm c2}(0) \approx 47 T is seen for both $H ∥ ab$ and $H ∥ c$ . 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.

10 pages, 4 figures

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

Abstract

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