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

被引：6
作者：
Koutroulakis, G. [1 ]
Yasuoka, H. [1 ,2 ]
Chudo, H. [1 ,2 ]
Tobash, P. H. [1 ]
Mitchell, J. N. [1 ]
Bauer, E. D. [1 ]
Thompson, J. D. [1 ]
机构：
[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
[2] Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan
来源：
NEW JOURNAL OF PHYSICS | 2014年 / 16卷
关键词：
NQR; heavy-fermion; unconventional superconductivity; Pu-115s; TEMPERATURE; RELAXATION; ELECTRONS;
D O I：
10.1088/1367-2630/16/5/053019
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report In-115 nuclear quadrupolar resonance (NQR) measurements on the heavy-fermion superconductor PuCoIn5, 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 similar or equal to 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 PuCoIn5 is a strong-coupling d-wave superconductor.
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页数：12
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