2020/11/23 by Martin Žemlička, M. Žemlička, M. Kopčík +8 · 8 citations
Chemistry · Materials Science · Physics and Astronomy · #Chemistry #Condensed matter physics #Critical field #Iron-based superconductors research #Magnetic field #Paramagnetism #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quantum tunnelling #Quasiparticle #Rare-earth and actinide compounds #Scanning tunneling microscope #Superconductivity #Zeeman effect #Zeeman energy #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.102.180508
published in Physical review. B./Physical review. B 102(18) (American Physical Society) · Equation (1) is corrected in this version. See the Erratum in PRB
openalex created_date 2020/11/23 · openalex publication_date 2020/11/23 · arxiv created 2021/09/10 · arxiv updated 2021/09/13 · openalex updated_date 2026/08/05
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.