Effects of paramagnetic pair-breaking and spin-orbital coupling on multi-band superconductivity

Yilikal Zeleke Ayino, Jin Yue, Tianqi Wang, Bharat Jalan, Vlad Pribiag

Research output: Contribution to journalArticle

Abstract

The BCS picture of superconductivity describes pairing between electrons originating from a single band. A generalization of this picture occurs in multi-band superconductors, where electrons from two or more bands contribute to superconductivity. The contributions of the different bands can result in an overall enhancement of the critical field and can lead to qualitative changes in the temperature dependence of the upper critical field when compared to the single-band case. While the role of orbital pair-breaking on the critical field of multi-band superconductors has been explored extensively, paramagnetic and spin-orbital scattering effects have received comparatively little attention. Here we investigate this problem using thin films of Nd-doped SrTiO3. We furthermore propose a model for analyzing the temperature-dependence of the critical field in the presence of orbital, paramagnetic and spin-orbital effects, and find a very good agreement with our data. Interestingly, we also observe a dramatic enhancement in the out-of-plane critical field to values well in excess of the Chandrasekhar-Clogston (Pauli) paramagnetic limit, which can be understood as a consequence of multi-band effects in the presence of spin-orbital scattering.

Original languageEnglish (US)
Article number38LT02
JournalJournal of Physics Condensed Matter
Volume32
Issue number38
DOIs
StatePublished - Sep 9 2020

Keywords

  • complex oxides
  • Superconductivity
  • thin-flm oxides

How much support was provided by MRSEC?

  • Primary

Reporting period for MRSEC

  • Period 7

PubMed: MeSH publication types

  • Journal Article

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  • Projects

    MRSEC SEED Projects

    11/1/14 → …

    Project: Research project

    University of Minnesota MRSEC (DMR-1420013)

    Lodge, T. P.

    11/1/1410/31/20

    Project: Research project

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