Fermi surface, possible unconventional fermions, and unusually robust resistive critical fields in the chiral-structured superconductor AuBe

2018/12/31 by Drew J. Rebar, Drew Rebar, Serena Birnbaum +13 · 26 citations
Materials Science · Physics and Astronomy · #Condensed matter physics #Fermi surface #Fermion #Heavy fermion #Heavy fermion superconductor #Iron-based superconductors research #Materials science #Physics #Quantum mechanics #Rare-earth and actinide compounds #Superconductivity #Topological Materials and Phenomena #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.99.094517

published in Physical review. B./Physical review. B 99(9) (American Physical Society)

arxiv created 2019/02/21 · openalex publication_date 2019/03/21 · arxiv updated 2019/03/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06

Abstract

AuBe is a fascinating binary metal with a chiral structure predicted to host exotic fermions. Despite the polycrystalline nature of the samples, a plethora of de Haas--van Alphen oscillations is observed, one series of which shows a strongly field-dependent effective mass and Berry phase, supporting the premise of unusual fermions. Moreover, AuBe exhibits superconductivity with a highly enhanced resistive critical field. This property is shown to be intrinsic to this material class, implying that topologically protected surface states are involved.

Citations

• Generalized Gradient Approximation Made Simple
• Helical Vortex Phase in the NoncentrosymmetricCePt3Si
• Classification of topological insulators and superconductors in three spatial dimensions

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