Extended nuclear quadrupole resonance study of the heavy-fermion superconductor PuCoGa5

Koutroulakis, Georgios; Yasuoka, Hiroshi; Tobash, Paul H.; Mitchell, Jeremy Neil; Bauer, Eric Dietzgen; Thompson, Joe David

doi:10.1103/PhysRevB.94.165115

Title: Extended nuclear quadrupole resonance study of the heavy-fermion superconductor ${PuCoGa}_{5}$

Journal Article · Mon Oct 10 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.165115· OSTI ID:1343707

Koutroulakis, Georgios ^[1]; Yasuoka, Hiroshi ^[2];

^[2];

^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States); UCLA, Los Angeles, CA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

PuCoGa₅ has emerged as a prototypical heavy-fermion superconductor, with its transition temperature (T_c≃18.5 K) being the highest amongst such materials. Nonetheless, a clear description as to what drives the superconducting pairing is still lacking, rendered complicated by the notoriously intricate nature of plutonium's 5f valence electrons. Here, we present a detailed ^69,71Ga nuclear quadrupole resonance (NQR) study of PuCoGa₅, concentrating on the system's normal state properties near to T_c and aiming to detect distinct signatures of possible pairing mechanisms. In particular, the quadrupole frequency and spin-lattice relaxation rate were measured for the two crystallographically inequivalent Ga sites and for both Ga isotopes, in the temperature range 1.6–300 K. No evidence of significant charge fluctuations is found from the NQR observables. On the contrary, the low-energy dynamics is dominated by anisotropic spin fluctuations with strong, nearly critical, in-plane character, which are effectively identical to the case of the sister compound PuCoIn₅. Lastly, these findings are discussed within the context of different theoretical proposals for the unconventional pairing mechanism in heavy-fermion superconductors.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1343707

Alternate ID(s):: OSTI ID: 1328588; OSTI ID: 1344362

Report Number(s):: LA-UR-16-24320; LA-UR-16-24563; PRBMDO; TRN: US1701546

Journal Information:: Physical Review B, Vol. 94, Issue 16; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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