Layered Superconductor in a Magnetic Field: Breakdown of the Effective Mass Model

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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, Hc2∥(0) and Hc2⊥(0), respectively. We find that Hc2∥(0)≈0.75|dHc2∥/dT|TcTc and that Hc2⊥(0)≈0.75|dHc2⊥/dT|TcTc, where dHc2∥/dT|Tc and dHc2⊥/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.

Original languageEnglish (US)
Pages (from-to)173-177
Number of pages5
JournalJETP Letters
Volume110
Issue number3
DOIs
StatePublished - Aug 1 2019

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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