Physical properties of the noncentrosymmetric superconductor Ru7B3
Physical properties of the noncentrosymmetric superconductor Ru7B3
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非中心对称超导体Ru7B3的物理性质
DOI：
10.1103/physrevb.79.144509
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发表时间：
2009-04-01
影响因子：
3.7
通讯作者：
Wen, Hai-Hu
中科院分区：
文献类型：
--
作者：
Fang, Lei;Yang, Huan;Wen, Hai-Hu
本文对T-C= 3.3K的非中心对称超导体Ru_7 B_3的物理性质进行了全面的研究。据发现，超流包括一个主要组成部分，而不是一个完整的间隙功能，如比热和低临界场测量所揭示的一个类似的配对对称性。结合电阻率（rho（xx）和rho（xy））和电子能带结构计算，通过自洽分析确定了超导态和正常态的物理参数。结果表明，Ru_（7 B_3）属于单带超导体，能隙为0.5meV，属于弱电子-声子耦合的Ⅱ类超导体。一个不寻常的“扭结”的功能，清楚地观察到在现场引起的电阻率曲线的加宽。可能的原因给出了这种不寻常的两步过渡。
Physical properties have been comprehensively investigated on the noncentrosymmetric superconductor Ru7B3 with T-C=3.3 K. It is found that the superfluid comprises a major component with a full-gap feature instead of a nodal-like pairing symmetry as revealed by specific-heat and lower-critical-field measurements. Combining with resistivity (rho(xx) and rho(xy)) and electronic band-structure calculation, the superconducting and normal-state physical parameters were determined by a self-consistent analysis. It is found that Ru7B3 may belong to a single band superconductor with energy gap of 0.5 meV and could be categorized into type-II superconductor with weak electron-phonon coupling. An unusual "kink" feature is clearly observed in the field induced broadening of the resistivity curves. Possible reasons are given for this unusual two-step transition.