Hybrid s-wave superconductivity in CrB2

Biswas, Sananda; Kreisel, Andreas; Valadkhani, Adrian; Dürrnagel, Matteo; Schwemmer, Tilman; Thomale, Ronny; Valentí, Roser; Mazin, Igor I.

doi:10.1103/physrevb.108.l020501

Hybrid s -wave superconductivity in CrB2

Journal Article · Wed Jul 05 00:00:00 EDT 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.108.l020501· OSTI ID:1991269

^[1]; ^[2]; Valadkhani, Adrian ^[3]; ^[4]; ^[5]; Thomale, Ronny ^[5]; ^[3]; Mazin, Igor I. ^[6]

Goethe-Universität Frankfurt (Germany); George Mason University
Universität Leipzig (Germany); University of Copenhagen (Denmark)
Goethe-Universität Frankfurt (Germany)
Julius-Maximilians-Universität Würzburg (Germany); ETH Zürich (Switzerland)
Julius-Maximilians-Universität Würzburg (Germany)
George Mason University, Fairfax, VA (United States)

In a metal with multiple Fermi pockets, the formation of s-wave superconductivity can be conventional due to electron-phonon coupling or unconventional due to spin fluctuations. Here, we analyze the hexagonal diboride CrB₂, which is an itinerant antiferromagnet at ambient conditions and turns superconducting upon increasing pressure. While the high-pressure behavior of T_c suggests conventional s-wave pairing, we find that spin fluctuations promoting unconventional s-wave pairing become important in the vicinity of the antiferromagnetic dome. As the symmetry class of the s-wave state is independent of its underlying mechanism, we argue that CrB₂ is a realization of a hybrid s-wave superconductor where unconventional and conventional s-wave mechanisms team up to form a joint superconducting dome.

View Accepted Manuscript (DOE)

Research Organization:: George Mason University, Fairfax, VA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0021089

OSTI ID:: 1991269

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 2 Vol. 108; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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