Microscopic properties of the heavy-fermion superconductor PuCoIn5 explored by nuclear quadrupole resonance

G Koutroulakis; H Yasuoka; H Chudo; P H Tobash; J N Mitchell; E D Bauer; J D Thompson

doi:10.1088/1367-2630/16/5/053019

New Journal of Physics (Jan 2014)

Microscopic properties of the heavy-fermion superconductor PuCoIn5 explored by nuclear quadrupole resonance

G Koutroulakis,
H Yasuoka,
H Chudo,
P H Tobash,
J N Mitchell,
E D Bauer,
J D Thompson

Affiliations

G Koutroulakis: Los Alamos National Laboratory, Los Alamos , NM 87545, USA
H Yasuoka: Los Alamos National Laboratory, Los Alamos , NM 87545, USA; Advanced Science Research Center, Japan Atomic Energy Agency , Tokai, Ibaraki, 319-1195, Japan
H Chudo: Los Alamos National Laboratory, Los Alamos , NM 87545, USA; Advanced Science Research Center, Japan Atomic Energy Agency , Tokai, Ibaraki, 319-1195, Japan
P H Tobash: Los Alamos National Laboratory, Los Alamos , NM 87545, USA
J N Mitchell: Los Alamos National Laboratory, Los Alamos , NM 87545, USA
E D Bauer: Los Alamos National Laboratory, Los Alamos , NM 87545, USA
J D Thompson: Los Alamos National Laboratory, Los Alamos , NM 87545, USA

DOI: https://doi.org/10.1088/1367-2630/16/5/053019
Journal volume & issue: Vol. 16, no. 5
p. 053019

Abstract

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We report ^115 In nuclear quadrupolar resonance (NQR) measurements on the heavy-fermion superconductor PuCoIn _5 , in the temperature range 0.29K ≤ T ≤ 75K. The NQR parameters for the two crystallographically inequivalent In sites are determined, and their temperature dependence is investigated. A linear shift of the quadrupolar frequency with lowering temperature below the critical value T _c is revealed, in agreement with the prediction for composite pairing . The nuclear spin–lattice relaxation rate T _1 ^−1 ( T ) clearly signals a superconducting (SC) phase transition at T _c ≃ 2.3 K, with strong spin fluctuations, mostly in-plane, dominating the relaxation process in the normal state near to T _c . Analysis of the T _1 ^−1 data in the SC state suggests that PuCoIn _5 is a strong-coupling d -wave superconductor.

Published in New Journal of Physics

ISSN: 1367-2630 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Science: Physics
Website: https://iopscience.iop.org/journal/1367-2630

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