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Title: Subphases in the superconducting state of CeIrIn 5 revealed by low-temperature c -axis heat transport

Journal Article · · Physical Review Research

Low-temperature (down to ~ 50 mK) thermal conductivity measurements with the heat flow direction along the interplane tetragonal c axis, κ c , were used to study the superconducting state of heavy fermion CeIrIn 5 . Measurements were performed in the magnetic fields both parallel to the heat flow direction H c , and transverse to it H a . Interplane heat conductivity in H c configuration shows negligible initial increase with magnetic field and a rapid rise on approaching H c 2 from below, similar to the expectations for the superconducting gap without line nodes. This observation is in stark contrast to monotonic increase found in the previous in-plane heat transport measurements. In the configuration with the magnetic field breaking the tetragonal symmetry of the lattice H a , κ c reveals nonmonotonic evolution with temperature and magnetic field suggesting subphase boundary in the superconducting state. The characteristic temperature T kink ~ 0.07 K of the subboundary is well within the domain of bulk superconductivity T c ~ 0.4 K and H c 2 ~ 1.0 T. These results are consistent with a superconducting gap with an equatorial line node and polar point nodes, a gap symmetry of the D 4 h point group, for which magnetic field along the tetragonal plane breaks the degeneracy of the multicomponent order parameter and induces a phase transition with nodal topology change.

Research Organization:
Ames Lab., Ames, IA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Iran National Science Foundation (INSF)
Grant/Contract Number:
AC02-07CH11358; SC0012704; 4004583
OSTI ID:
1854293
Alternate ID(s):
OSTI ID: 1856809
Report Number(s):
IS-J 10,762; PPRHAI; 013192
Journal Information:
Physical Review Research, Journal Name: Physical Review Research Vol. 4 Journal Issue: 1; ISSN 2643-1564
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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