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arXiv 1603.02540cond-mat.supr-con
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beta-Bi2Pd的单能隙超导性

Single gap superconductivity in beta-Bi2Pd

J. Kačmarčík, Z. Pribulová, T. Samuely, P. Szabó, V. Cambel, J. Šoltýs, E. Herrera, H. Suderow, A. Correa-Orellana, D. Prabhakaran, P. Samuely

摘要:

β-Bi_2Pd化合物已被提出作为多能隙超导体的另一个例子[Y. Imai等人,J.Phys.Soc.Jap.81,113708(2012)]。在这里,我们报告几个重要的物理量的测量能够显示我们的超导单晶β-Bi 2 Pd的临界温度Tc接近5 K的多个能隙的存在。通过灵敏的交流技术的量热研究表明,在超导转变的急剧异常,但只有一个单一的能隙检测。从量热测量推断的索末菲系数的场依赖性和上临界磁场的温度和角度依赖性也明确地指向标准的单s波带隙超导性。霍尔探针磁强计提供了相同的结果,从分析的温度依赖性的较低的临界场。通过扫描隧道谱测量,检测到单能隙BCS态密度。然后,体相和表面敏感探针都证明了该体系具有标准的常规超导性,其中最近用ARPES探测到了拓扑保护的表面态[M. Sakano等人,6,8595(2015)]。

英文摘要:

beta-Bi2Pd compound has been proposed as another example of a multi-gap superconductor [Y. Imai et al., J. Phys. Soc. Jap. 81, 113708 (2012)]. Here, we report on measurements of several important physical quantities capable to show a presence of multiple energy gaps on our superconducting single crystals of beta-Bi2Pd with the critical temperature Tc close to 5 K. The calorimetric study via a sensitive ac technique shows a sharp anomaly at the superconducting transition, however only a single energy gap is detected. Also other characteristics inferred from calorimetric measurements as the field dependence of the Sommerfeld coefficient and the temperature and angular dependence of the upper critical magnetic field point unequivocally to standard single s-wave gap superconductivity. The Hall-probe magnetometry provides the same result from the analysis of the temperature dependence of the lower critical field. A single-gapped BCS density of states is detected by the scanning tunneling spectroscopy measurements. Then, the bulk as well as the surface sensitive probes evidence a standard conventional superconductivity in this system where the topologically protected surface states have been recently detected by ARPES [M. Sakano et al., Nature Comm. 6, 8595 (2015)] .

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