论文标题
Zeeman驱动的超导体绝缘子在强大的MOC薄膜中。 STM和横向磁场中的运输研究
Zeeman driven superconductor insulator transition in strongly disordered MoC film. STM and transport studies in transverse magnetic field
论文作者
论文摘要
在高度无序的MOC膜中研究了横向磁场中的超导体绝缘体过渡，该膜具有费米动量的产物和平均的自由路径$ k_f*l $接近Unity。令人惊讶的是，Zeeman的顺磁效应在过渡两侧的轨道耦合上占主导地位。在超导状态下，高临界磁场$ b_ {c2} $通过其平方根依赖温度以及通过扫描隧道显微镜测量的状态（DOS）的Zeeman分裂来证明。在$ b_ {c2} $中观察到DOS中的对数异常。这种异常在增加的磁场中进一步增强，这是通过将系统驱动到更具绝缘或电阻状态的Altshuler-Aronov DOS的Zeeman分裂来解释的。还需要旋转依赖的AltShuler-Aronov校正来解释$ B_ {C2} $上方的运输行为。
Superconductor insulator transition in transverse magnetic field is studied in the 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 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 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. Spin dependent Altshuler-Aronov correction is also needed to explain the transport behavior above $B_{c2}$.
