Resonances in the Field-Angle-Resolved Thermal Conductivity of
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
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.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1374324
- Alternate ID(s):
- OSTI ID: 1356873
- Report Number(s):
- LA-UR-16-29172; PRLTAO; TRN: US1702783
- Journal Information:
- Physical Review Letters, Vol. 118, Issue 19; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Evidence for a Spatially Modulated Superfluid Phase of under Confinement
|
journal | February 2019 |
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