Layered Superconductor in a Magnetic Field: Breakdown of the Effective Mass Model
Abstract
We theoretically study the upper critical magnetic fields at zero temperature in a quasi-two-dimensional (Q2D) superconductor in the parallel and perpendicular fields, H_{c2}^allel(0) and H_{c2}^\perp(0), respectively. We find that H_{c2}^allel(0)≈0.75|dH_{c2}^allel/dT|_{T{_c}}T_c and that H_{c2}^\perp(0)≈0.75|dH_{c2}^\perp/dT|_{T{_c}}T_c , where dH_{c2}^allel/dT|_{Tc} and dH_{c2}^\perp/dT|_{Tc} are the corresponding Ginzburg-Landau slopes of the upper critical magnetic fields. Our results demonstrate the breakdown of the so-called effective mass model in Q2D case and may be partially responsible for the experimentally observed deviations from the effective mass model in a number of layered superconductors, including MgB2.
- Publication:
-
Soviet Journal of Experimental and Theoretical Physics Letters
- Pub Date:
- August 2019
- DOI:
- 10.1134/S0021364019150025
- arXiv:
- arXiv:2001.11537
- Bibcode:
- 2019JETPL.110..173L
- Keywords:
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- Condensed Matter - Superconductivity
- E-Print:
- 5 pages, 1 figure