Fermi Surface, Possible Unconventional Fermions, and Unusually Robust Resistive Critical Fields in the Chiral-Structured Superconductor AuBe

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dc.contributor.ORCID0000-0003-4434-2160 (Chan, JY)
dc.contributor.authorRebar, D. J.
dc.contributor.authorBirnbaum, S. M.
dc.contributor.authorSingleton, J.
dc.contributor.authorKhan, M.
dc.contributor.authorBall, J. C.
dc.contributor.authorAdams, P. W.
dc.contributor.authorChan, Julia Y.
dc.contributor.authorYoung, D. P.
dc.contributor.authorBrowne, D. A.
dc.contributor.authorDitusa, J. F.
dc.contributor.utdAuthorChan, Julia Y.
dc.date.accessioned2019-12-18T22:15:43Z
dc.date.available2019-12-18T22:15:43Z
dc.date.created2019-03-21
dc.description.abstractThe noncentrosymmetric superconductor (NCS) AuBe is investigated using a variety of thermodynamic and resistive probes in magnetic fields of up to 65 T and temperatures down to 0.3 K. Despite the polycrystalline nature of the samples, the observation of a complex series of de Haas-van Alphen (dHvA) oscillations has allowed the calculated band structure for AuBe to be validated. This permits a variety of BCS parameters describing the superconductivity to be estimated, despite the complexity of the measured Fermi surface. In addition, AuBe displays a nonstandard field dependence of the phase of dHvA oscillations associated with a band thought to host unconventional fermions in this chiral lattice. This result demonstrates the power of the dHvA effect to establish the properties of a single band despite the presence of other electronic bands with a larger density of states, even in polycrystalline samples. In common with several other NCSs, we find that the resistive upper critical field exceeds that measured by heat capacity and magnetization by a considerable factor. We suggest that our data exclude mechanisms for such an effect associated with disorder, implying that topologically protected superconducting surface states may be involved. ©2019 American Physical Society.
dc.description.departmentSchool of Natural Sciences and Mathematics
dc.description.sponsorshipNational Science Foundation (NSF) Grant Nos. DMR1206763, DMR1306392, DMR1700030, DMR-1157490; Department of Energy through Grant No. DE-FG02-007ER46420.
dc.identifier.bibliographicCitationRebar, D. J., S. M. Birnbaum, J. Singleton, M. Khan, et al. 2019. "Fermi surface, possible unconventional fermions, and unusually robust resistive critical fields in the chiral-structured superconductor AuBe." Physical Review B 99(9). art. 094517, doi: 10.1103/PhysRevB.99.094517
dc.identifier.issn2469-9950
dc.identifier.issue9
dc.identifier.urihttps://hdl.handle.net/10735.1/7141
dc.identifier.volume99
dc.language.isoen
dc.publisherAmerican Physical Society
dc.relation.urihttps://dx.doi.org/10.1103/PhysRevB.99.094517
dc.rights©2019 American Physical Society
dc.source.journalPhysical Review B
dc.subjectFermi surfaces
dc.subjectSpecific heat
dc.subjectSuperconductors
dc.subjectde Haas–van Alphen effect
dc.subjectPolycrystals
dc.subjectBinary systems (Metallurgy)
dc.titleFermi Surface, Possible Unconventional Fermions, and Unusually Robust Resistive Critical Fields in the Chiral-Structured Superconductor AuBe
dc.type.genrearticle

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