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Title: Resonances in the Field-Angle-Resolved Thermal Conductivity of CeCoIn 5

Abstract

Here, the thermal conductivity measurement in a rotating magnetic field is a powerful probe of the structure of the superconducting energy gap. We present high-precision measurements of the low-temperature thermal conductivity in the unconventional heavy-fermion superconductor CeCoIn 5, with the heat current J along the nodal [110] direction of its d x2–y2 order parameter and the magnetic field up to 7 T rotating in the ab plane. In contrast to the smooth oscillations found previously for J∥[100], we observe a sharp resonancelike peak in the thermal conductivity when the magnetic field is also in the [110] direction, parallel to the heat current. We explain this peak qualitatively via a model of the heat transport in a d-wave superconductor. In addition, we observe two smaller but also very sharp peaks in the thermal conductivity for the field directions at angles Θ≈±33° with respect to J. The origin of the observed resonances at Θ≈±33° at present defies theoretical explanation. The challenge of uncovering their source will dictate exploring theoretically more complex models, which might include, e.g., fine details of the Fermi surface, Andreev bound vortex core states, a secondary superconducting order parameter, and the existence of gaps in spin and charge excitations.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1374324
Alternate Identifier(s):
OSTI ID: 1356873
Report Number(s):
LA-UR-16-29172
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US1702783
Grant/Contract Number:
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 19; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Material Science

Citation Formats

Kim, Duk Y., Lin, Shi -Zeng, Weickert, Franziska, Bauer, Eric D., Ronning, Filip, Thompson, J. D., and Movshovich, Roman. Resonances in the Field-Angle-Resolved Thermal Conductivity of CeCoIn5. United States: N. p., 2017. Web. doi:10.1103/PhysRevLett.118.197001.
Kim, Duk Y., Lin, Shi -Zeng, Weickert, Franziska, Bauer, Eric D., Ronning, Filip, Thompson, J. D., & Movshovich, Roman. Resonances in the Field-Angle-Resolved Thermal Conductivity of CeCoIn5. United States. doi:10.1103/PhysRevLett.118.197001.
Kim, Duk Y., Lin, Shi -Zeng, Weickert, Franziska, Bauer, Eric D., Ronning, Filip, Thompson, J. D., and Movshovich, Roman. Fri . "Resonances in the Field-Angle-Resolved Thermal Conductivity of CeCoIn5". United States. doi:10.1103/PhysRevLett.118.197001. https://www.osti.gov/servlets/purl/1374324.
@article{osti_1374324,
title = {Resonances in the Field-Angle-Resolved Thermal Conductivity of CeCoIn5},
author = {Kim, Duk Y. and Lin, Shi -Zeng and Weickert, Franziska and Bauer, Eric D. and Ronning, Filip and Thompson, J. D. and Movshovich, Roman},
abstractNote = {Here, the thermal conductivity measurement in a rotating magnetic field is a powerful probe of the structure of the superconducting energy gap. We present high-precision measurements of the low-temperature thermal conductivity in the unconventional heavy-fermion superconductor CeCoIn5, with the heat current J along the nodal [110] direction of its dx2–y2 order parameter and the magnetic field up to 7 T rotating in the ab plane. In contrast to the smooth oscillations found previously for J∥[100], we observe a sharp resonancelike peak in the thermal conductivity when the magnetic field is also in the [110] direction, parallel to the heat current. We explain this peak qualitatively via a model of the heat transport in a d-wave superconductor. In addition, we observe two smaller but also very sharp peaks in the thermal conductivity for the field directions at angles Θ≈±33° with respect to J. The origin of the observed resonances at Θ≈±33° at present defies theoretical explanation. The challenge of uncovering their source will dictate exploring theoretically more complex models, which might include, e.g., fine details of the Fermi surface, Andreev bound vortex core states, a secondary superconducting order parameter, and the existence of gaps in spin and charge excitations.},
doi = {10.1103/PhysRevLett.118.197001},
journal = {Physical Review Letters},
number = 19,
volume = 118,
place = {United States},
year = {Fri May 12 00:00:00 EDT 2017},
month = {Fri May 12 00:00:00 EDT 2017}
}

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