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arXiv 1001.4017cond-mat.supr-con
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FeTe0. 6Se 0.4超导体上临界场中主要泡利顺磁效应的证据

Evidence for dominant Pauli paramagnetic effect in the upper critical fields of a FeTe0.6Se0.4 superconductor

Seunghyun Khim, Jae Wook Kim, Eun Sang Choi, Yunkyu Bang, Minoru Nohara, Hidenori Takagi, Kee Hoon Kim

摘要:

通过测量超导体FeTe_(0.6)Se_(0.4)单晶在高达45 T的静态磁场中的电阻率,研究了超导体上临界场H_c ~ 2(T)与温度的关系。Hc 2ab(T)曲线的强弯曲和Hc 2ab(0)~ Hc 2c(0)~ 48 T的近各向同性的观察支持了强泡利顺磁效应的存在。结果表明,同时考虑Pauli极限和自旋轨道散射的Werthamer-Helfand-Hohenberg公式可以有效地描述Hc 2ab(T)和Hc 2c(T)曲线.准粒子态密度的增强或增加的散射所造成的Te(Se)空位或过量的Fe被讨论作为一个可能的起源表现泡利顺磁效应。

英文摘要:

We investigate temperature-dependence of the upper critical fields Hc2(T) of a superconducting FeTe0.6Se0.4 single crystal by measuring resistivity in static magnetic fields up to 45 T. The observations of strong bending in the Hc2ab(T) curves and nearly isotropic Hc2ab(0) ~ Hc2c(0) ~ 48 T support the presence of strong Pauli paramagnetic effect. We show that the Werthamer-Helfand-Hohenberg formula considering the Pauli limiting and the spin-orbit scattering together can effectively describe both Hc2ab(T) and Hc2c(T) curves. The enhancement in quasi-particle density of states or increased scattering resulting from Te(Se) vacancy or excess Fe is discussed as a possible origin for the manifesting Pauli paramagnetic effect.

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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