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

Abstract

The 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. Overall, 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.

Authors:
 [1];  [2]; ORCiD logo [2];  [3];  [1];  [1];  [4];  [1];  [1];  [1]
  1. Louisiana State Univ., Baton Rouge, LA (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). National High Magnetic Field Lab. (MagLab)
  3. Louisiana State Univ., Baton Rouge, LA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Univ. of Texas at Dallas, Richardson, TX (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Louisiana State Univ., Baton Rouge, LA (United States)
Sponsoring Org.:
USDOE; National Science Foundation (NSF)
OSTI Identifier:
1772412
Alternate Identifier(s):
OSTI ID: 1546192; OSTI ID: 2283901
Report Number(s):
LA-UR-18-31277
Journal ID: ISSN 2469-9950; TRN: US2206962
Grant/Contract Number:  
89233218CNA000001; DMR1206763; FG02-07ER46420; DMR1306392; DMR1700030; DMR-1157490
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 9; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; High magnetic field science; dirac fermions; electronic structure; Fermi surface; fermions; Majorana fermions; superconductivity; surface states; Weyl fermions

Citation Formats

Rebar, Drew J., Birnbaum, Serena M., Singleton, John, Khan, Mojammel, Ball, J. C., Adams, P. W., Chan, Julia Y., Young, D. P., Browne, Dana A., and DiTusa, J. F. Fermi surface, possible unconventional fermions, and unusually robust resistive critical fields in the chiral-structured superconductor AuBe. United States: N. p., 2019. Web. doi:10.1103/physrevb.99.094517.
Rebar, Drew J., Birnbaum, Serena M., Singleton, John, Khan, Mojammel, Ball, J. C., Adams, P. W., Chan, Julia Y., Young, D. P., Browne, Dana A., & DiTusa, J. F. Fermi surface, possible unconventional fermions, and unusually robust resistive critical fields in the chiral-structured superconductor AuBe. United States. https://doi.org/10.1103/physrevb.99.094517
Rebar, Drew J., Birnbaum, Serena M., Singleton, John, Khan, Mojammel, Ball, J. C., Adams, P. W., Chan, Julia Y., Young, D. P., Browne, Dana A., and DiTusa, J. F. Thu . "Fermi surface, possible unconventional fermions, and unusually robust resistive critical fields in the chiral-structured superconductor AuBe". United States. https://doi.org/10.1103/physrevb.99.094517. https://www.osti.gov/servlets/purl/1772412.
@article{osti_1772412,
title = {Fermi surface, possible unconventional fermions, and unusually robust resistive critical fields in the chiral-structured superconductor AuBe},
author = {Rebar, Drew J. and Birnbaum, Serena M. and Singleton, John and Khan, Mojammel and Ball, J. C. and Adams, P. W. and Chan, Julia Y. and Young, D. P. and Browne, Dana A. and DiTusa, J. F.},
abstractNote = {The 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. Overall, 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.},
doi = {10.1103/physrevb.99.094517},
journal = {Physical Review. B},
number = 9,
volume = 99,
place = {United States},
year = {Thu Mar 21 00:00:00 EDT 2019},
month = {Thu Mar 21 00:00:00 EDT 2019}
}

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Works referencing / citing this record:

Unusual phase boundary of the magnetic-field-tuned valence transition in CeOs 4 Sb 12
journal, February 2020