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arXiv 1609.09259cond-mat.supr-con
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原始和质子辐照Ca8(Pt3As8)(Fe2As2)5单晶中的涨落磁导率

Fluctuation magnetoconductivity in pristine and protonirradiated Ca8.5La1.5(Pt3As8)(Fe2As2)5 single crystals

D. Ahmad, Y. I. Seo, W. J. Choi, Yong Seung Kwon

摘要:

研究了质子辐照对Ca_(8.5)La_(1.5)(Pt_3As_8)(Fe_2As_2)_5单晶热涨落诱导电导率的影响。面内磁导率的测量高达H= 13 T。据观察,Tc被抑制高达30.3从32.5 K时,质子被照射,而波动效应的幅度是几乎相同的,在两个样品。结果进行了分析的Ullah和Dorsey标度函数的基础上的Hartree近似的金兹伯格-朗道自由能,包括临界波动制度。在原始样品中,在Tc附近观察到波动效应中的3D-2D交叉。当3D-2D发生时,新发现存在由2D和3D涨落行为同时描述的区域。同时,质子辐照样品显示出三维起伏。

英文摘要:

The influence of the proton irradiation on the thermally fluctuation-induced conductivity in Ca8.5La1.5(pt3As8)(Fe2As2)5 single crystal was investigatyed. The in-plane magnetoconductivity was measured up to H=13T. It is observed that the Tc was suppressed up to 30.3 from 32.5 K when the proton is irradiated whereas the amplitude of the fluctuation effect is the almost same in both samples. The results were analyzed by the Ullah and Dorsey scaling functions based on the Hartree approximation to the Ginzburg-Landau free energy, including the critical-fluctuation regime. In the pristine sample, the 3D-2D crossover in the fluctuation effect was observed near the Tc. When the 3D-2D occurs, it is newly found that there is a regime simultaneously described by 2D and 3D fluctuation behaviors. Meanwhile, the proton-irradiated sample showed the 3D fluctuation.

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