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arXiv 0909.5328cond-mat.supr-concond-mat.str-el
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Fe1. 11 Te 0.6 Se 0.4单晶超导上临界场的弱各向异性

Weak anisotropy of the superconducting upper critical field in Fe1.11Te0.6Se0.4 single crystals

M. H. Fang, J. H. Yang, F. F. Balakirev, Y. Kohama, J. Singleton, B. Qian, Z. Q. Mao, H. D. Wang, H. Q. Yuan

摘要:

我们用高达60 T的脉冲磁场测量了超导体Fe_(1.11)Te_(0.6)Se_(0.4)单晶的电阻上临界场H_c ~ 2。尽管超导转变温度较低(Tc约为14 K),但得到了很高的零温上临界场μ_0 Hc ~ 2(0),约为47 T。此外,Hc 2遵循不寻常的温度依赖性,当温度T=0时,变得几乎与磁场取向无关。我们认为Fe_(1.11)Te_(0.6)Se_(0.4)的各向同性超导电性是其三维费米面拓扑结构的结果。对于(Ba,K)Fe 2As 2得到了类似的结果,表明所有层状铁基超导体都表现出与高Tc铜酸盐显著不同的一般行为。

英文摘要:

We have determined the resistive upper critical field Hc2 for single crystals of the superconductor Fe1.11Te0.6Se0.4 using pulsed magnetic fields of up to 60T. A rather high zero-temperature upper critical field of mu0Hc2(0) approx 47T is obtained, in spite of the relatively low superconducting transition temperature (Tc approx 14K). Moreover, Hc2 follows an unusual temperature dependence, becoming almost independent of the magnetic field orientation as the temperature T=0. We suggest that the isotropic superconductivity in Fe1.11Te0.6Se0.4 is a consequence of its three-dimensional Fermi-surface topology. An analogous result was obtained for (Ba,K)Fe2As2, indicating that all layered iron-based superconductors exhibit generic behavior that is significantly different from that of the high-Tc cuprates.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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