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 $k_{F}l$ 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 $B_{c2}$, 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 $B_{c2}$ 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 $B_{c2}$.

中文翻译：

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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 ${ķ}_F升$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${乙}_{C2}$，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${乙}_{C2}$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${乙}_{C2}$。