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arXiv 1003.3812cond-mat.supr-con
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FeSe1-xTex上临界场中各向异性涡旋动力学和Pauli极限的证据

Evidence for Anisotropic Vortex Dynamics and Pauli Limitation in the Upper Critical Field of FeSe1-xTex

Daniel Braithwaite, Gérard Lapertot, William Knafo, Ilya Sheikin

摘要:

我们用高静态和脉冲磁场下的电阻率测量以及高达9 T的比热测量确定了FeSe_(1-x)Tex(x=0.52)单晶的HC_2(T)。我们发现,从电阻率测量确定的HC 2(T)的初始斜率的显着的各向异性,是不存在的,当HC 2是从比热结果确定。这表明热力学上临界场几乎是各向同性的,各向异性涡旋动力学起作用。在脉冲场中的行为中发现了各向异性涡旋动力学的进一步证据。我们还发现,泡利限制必须包括,以适应HC 2的温度依赖性,表明可能更高的有效质量FeSe 1-xTex比其他Fe超导体。

英文摘要:

We have determined HC2(T) for FeSe1-xTex (x=0.52) single crystals using resistivity measurements at high static and pulsed magnetic field, as well as specific heat measurements up to 9T. We find that the significant anisotropy of the initial slope of HC2(T) determined from resistivity measurements, is not present when HC2 is determined from the specific heat results. This suggests that the thermodynamic upper critical field is almost isotropic, and that anisotropic vortex dynamics play a role. Further evidence of anisotropic vortex dynamics is found in the behaviour in pulsed field. We also find that Pauli limiting must be included in order to fit the temperature dependence of HC2, indicating probably higher effective mass in FeSe1-xTex than in other Fe superconductors.

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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