Journal
COMMUNICATIONS PHYSICS
Volume 3, Issue 1, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s42005-020-00418-x
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Funding
- MEXT [JP19K03747, JP23102717, JP25400374]
- NSFC [11634015]
- MOST [2016YFA0300300, 2017YFA0302904, 2017YFA0303103]
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering
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A fundamental problem posed from the study of correlated electron compounds, of which heavy-fermion systems are prototypes, is the need to understand the physics of states near a quantum critical point (QCP). At a QCP, magnetic order is suppressed continuously to zero temperature and unconventional superconductivity often appears. Here, we report pressure T-c. (P)-dependent In-115 nuclear quadrupole resonance (NQR) measurements on heavy-fermion antiferromagnet CeRh0.5Ir0.5In5. These experiments reveal an antiferromagnetic (AF) QCP at P-c(AF) = 1.2 GPa where a dome of superconductivity reaches a maximum transition temperature Tc. Preceding P-c(AF), however, the NQR frequency nu(Q) undergoes an abrupt increase at P-c* = 0.8 GPa in the zero-temperature limit, indicating a change from localized to itinerant character of cerium's f-electron and associated small-to-large change in the Fermi surface. At P-c(AF) where T-c is optimized, there is an unusually large fraction of gapless excitations well below T-c that implicates spin-singlet, odd-frequency pairing symmetry.
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