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Zeeman-driven superconductor-insulator transition in strongly disordered MoC films: Scanning tunneling microscopy and transport studies in a transverse magnetic field
Physical Review B ( IF 3.2 ) Pub Date : 2020-11-23 , DOI: 10.1103/physrevb.102.180508
M. Žemlička , M. Kopčík , P. Szabó , T. Samuely , J. Kačmarčík , P. Neilinger , M. Grajcar , P. Samuely

The superconductor-insulator transition in a transverse magnetic field is studied in a highly disordered MoC film with the product of the Fermi momentum and the mean free path kFl close to unity. Surprisingly, the Zeeman paramagnetic effects dominate over orbital coupling on both sides of the transition. In the superconducting state it is evidenced by a high upper critical magnetic field Bc2, by its square-root dependence on temperature, as well as by the Zeeman splitting of the quasiparticle density of states (DOS) measured by scanning tunneling microscopy. At Bc2 a logarithmic anomaly in DOS is observed. This anomaly is further enhanced in an increasing magnetic field, which is explained by the Zeeman splitting of the Altshuler-Aronov DOS driving the system into a more insulating or resistive state. A spin-dependent Altshuler-Aronov correction is also needed to explain the transport behavior above Bc2.

中文翻译:

塞曼驱动的超导MoC薄膜中的超导体-绝缘体转变:横向磁场中的扫描隧道显微镜和传输研究

在费米动量和平均自由程的乘积下,在高度无序的MoC薄膜中研究了横向磁场中的超导体-绝缘体跃迁 ķF接近团结。令人惊讶的是,塞曼顺磁效应在过渡两面的轨道耦合中占主导地位。在超导状态下,可以通过较高的上临界磁场来证明C2,其对温度的平方根依赖性,以及通过扫描隧道显微镜测量的准粒子状态密度(DOS)的塞曼分裂。在C2在DOS中观察到对数异常。随着磁场的增加,这种异常现象进一步加剧,这可以通过将阿尔茨勒-阿罗诺夫DOS的Zeeman分裂将系统驱动到更绝缘或更具抵抗性的状态来解释。还需要自旋相关的Altshuler-Aronov校正来解释上面的传输行为C2
更新日期:2020-11-25
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