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arXiv 1003.1171cond-mat.supr-concond-mat.mtrl-sci
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Fe1.05 Te 0.85 Se 0.15单晶中弱超导涨落和上临界场的小各向异性

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

摘要:

研究了Fe $_{1.05}$ Te $_{0.85}$ Se $_{0.15}$单晶的电阻上临界场($μ_{0}H_{\rm c2}(T)$)的温度依赖性,该单晶在$T_{\rm c} \sim 14 K, in magnetic fields of up to 55 T. Two-dimensional feature and superconducting fluctuations of the samples are found to be weak, because the resistive broadening effect on applied magnetic fields of up to 14 T is small. The Pauli paramagnetic effect is obviously evidenced by the strong suppression of the $ μ_{0} H_{\rm c2} ^{ab}(T)$ ($ H \parallel ab $) curve and nearly isotropic $ μ_{0} H_{\rm c2}(0)\approx 47 T对$H \parallel ab$和$H \parallel c$都有超导性.这一事实与以前报道的Fe $_{1+y}$ Te $_{0.6}$ Se $_{0.4}$单晶的结果几乎相同。本文讨论了Fe $_{1+y}$(Te,Se)系统低温下上临界场随Te/Se比值变化的小的各向异性。

英文摘要:

We have investigated the temperature dependence of the resistive upper critical fields ($μ_{0}H_{\rm c2}(T)$) for an Fe$_{1.05}$Te$_{0.85}$Se$_{0.15}$ single crystal, which exhibit superconductivity at $T_{\rm c} \sim 14 K, in magnetic fields of up to 55 T. Two-dimensional feature and superconducting fluctuations of the samples are found to be weak, because the resistive broadening effect on applied magnetic fields of up to 14 T is small. The Pauli paramagnetic effect is obviously evidenced by the strong suppression of the $μ_{0}H_{\rm c2}^{ab}(T)$ ($H \parallel ab$) curve and nearly isotropic $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.

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