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Title: Vortexlike excitations in the heavy-fermion superconductor CeIrIn 5

Here, we report a systematic study of temperature- and field-dependent charge (ρ) and entropy (S) transport in the heavy-fermion superconductor CeIrIn 5. Its large positive thermopower S xx is typical of Ce-based Kondo lattice systems, and strong electronic correlations play an important role in enhancing the Nernst signal S xy. By separating the off-diagonal Peltier coefficient α xy from S xy, we find that αxy becomes positive and greatly enhanced at temperatures well above the bulk T c. Compared with the nonmagnetic analog LaIrIn 5, these results suggest vortexlike excitations in a precursor state to unconventional superconductivity in CeIrIn 5. This study sheds light on the similarity of heavy-fermion and cuprate superconductors and on the possibility of states not characterized by the amplitude of an order parameter.
Authors:
 [1] ;  [1] ;  [1] ;  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
OSTI Identifier:
1255264
Report Number(s):
LA-UR-15-29500
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1601733
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 20; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE