# Zeeman-driven superconductor-insulator transition in strongly disordered MoC films: Scanning tunneling microscopy and transport studies in a transverse magnetic field

Zemlicka M, Kopčík M, Szabó P, Samuely T, Kačmarčík J, Neilinger P, Grajcar M, Samuely P. 2020. Zeeman-driven superconductor-insulator transition in strongly disordered MoC films: Scanning tunneling microscopy and transport studies in a transverse magnetic field. Physical Review B. 102(18), 180508.

Journal Article | Published | English

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Author
Zemlicka, MartinIST Austria; Kopčík, M.; Szabó, P.; Samuely, T.; Kačmarčík, J.; Neilinger, P.; Grajcar, M.; Samuely, P.
Department
Abstract
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 kF*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 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 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 𝐵𝑐2.
Publishing Year
Date Published
2020-11-01
Journal Title
Physical Review B
Acknowledgement
We gratefully acknowledge helpful conversations with B.L. Altshuler and R. Hlubina. The work was supported by the projects APVV-18-0358, VEGA 2/0058/20, VEGA 1/0743/19 the European Microkelvin Platform, the COST action CA16218 (Nanocohybri) and by U.S. Steel Košice.
Volume
102
Issue
18
Article Number
180508
ISSN
eISSN
IST-REx-ID

### Cite this

Zemlicka M, Kopčík M, Szabó P, et al. Zeeman-driven superconductor-insulator transition in strongly disordered MoC films: Scanning tunneling microscopy and transport studies in a transverse magnetic field. Physical Review B. 2020;102(18). doi:10.1103/PhysRevB.102.180508
Zemlicka, M., Kopčík, M., Szabó, P., Samuely, T., Kačmarčík, J., Neilinger, P., … Samuely, P. (2020). Zeeman-driven superconductor-insulator transition in strongly disordered MoC films: Scanning tunneling microscopy and transport studies in a transverse magnetic field. Physical Review B. American Physical Society. https://doi.org/10.1103/PhysRevB.102.180508
Zemlicka, Martin, M. Kopčík, P. Szabó, T. Samuely, J. Kačmarčík, P. Neilinger, M. Grajcar, and P. Samuely. “Zeeman-Driven Superconductor-Insulator Transition in Strongly Disordered MoC Films: Scanning Tunneling Microscopy and Transport Studies in a Transverse Magnetic Field.” Physical Review B. American Physical Society, 2020. https://doi.org/10.1103/PhysRevB.102.180508.
M. Zemlicka et al., “Zeeman-driven superconductor-insulator transition in strongly disordered MoC films: Scanning tunneling microscopy and transport studies in a transverse magnetic field,” Physical Review B, vol. 102, no. 18. American Physical Society, 2020.
Zemlicka M, Kopčík M, Szabó P, Samuely T, Kačmarčík J, Neilinger P, Grajcar M, Samuely P. 2020. Zeeman-driven superconductor-insulator transition in strongly disordered MoC films: Scanning tunneling microscopy and transport studies in a transverse magnetic field. Physical Review B. 102(18), 180508.
Zemlicka, Martin, et al. “Zeeman-Driven Superconductor-Insulator Transition in Strongly Disordered MoC Films: Scanning Tunneling Microscopy and Transport Studies in a Transverse Magnetic Field.” Physical Review B, vol. 102, no. 18, 180508, American Physical Society, 2020, doi:10.1103/PhysRevB.102.180508.
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arXiv 2011.04329