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arXiv 1903.04321cond-mat.supr-con
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Cu插层PdTe $_2$中增强的均匀型II超导电性

Enhanced, homogeneous type II superconductivity in Cu-intercalated PdTe$_2$

Aastha Vasdev, Anshu Sirohi, M. K. Hooda, C. S Yadav, Goutam Sheet

摘要:

虽然第二类狄拉克半金属PdTe $_2$的超导相在本质上是传统的,但它的磁性仍然令人感兴趣。虽然某些实验表明了一个意想不到的I型超导相,但其他实验揭示了在磁场的作用下形成的涡旋。最近,扫描隧道光谱(STS)实验揭示了混合相的存在,其中I型和II型行为共存。在这里,基于我们的温度和磁场相关的STS实验的Cu嵌入PdTe $_2$,我们表明,作为超导相的临界温度上升到2.4 K的Cu嵌入,混合相消失,系统成为均匀的II型。这可能是由于Cu原子介导的I型和II型结构域之间的准粒子交换引起的平均效应,以及由于增加的无序而导致的相干长度减小。

英文摘要:

Though the superconducting phase of the type-II Dirac semimetal PdTe$_2$ was shown to be conventional in nature, the phase continued to be interesting in terms of its magnetic properties. While certain experiments indicated an unexpected type-I superconducting phase, other experiments revealed formation of vortices under the application of magnetic fields. Recently, scanning tunneling spectroscopy (STS) experiments revealed the existence of a mixed phase where type-I and type-II behaviours coexist. Here, based on our temperature and magnetic field dependent STS experiments on Cu-intercalated PdTe$_2$ we show that as the critical temperature of the superconducting phase goes up from 1.7 K to 2.4 K on Cu-intercalation, the mixed phase disappears and the system becomes homogeneously type-II. This may be attributed to an averaging effect caused by quasiparticle exchange between type-I and type-II domains mediated by the Cu atoms and to decreased coherence length due to increased disorder.

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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