237Np nuclear relaxation rate in heavy fermion superconductor NpPd5Al2

被引：5

作者：

Chudo, H. ^{[1
]}

Tokunaga, Y. ^{[1
]}

Kambe, S. ^{[1
]}

Sakai, H. ^{[1
]}

Haga, Y. ^{[1
]}

Matsuda, T. D. ^{[1
]}

Onuki, Y. ^{[1
]}

Yasuoka, H. ^{[1
]}

Aoki, D. ^{[2
]}

Homma, Y. ^{[2
]}

Walstedt, R. E. ^{[3
]}

机构：

[1] Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan

[2] Tohoku Univ, Inst Mat Res, Oarai, Ibaraki 3111313, Japan

[3] Univ Michigan, Dept Phys, Ann Arbor, MI 48105 USA

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 09期

基金：

日本学术振兴会;

关键词：

SPIN-LATTICE-RELAXATION; U-235; NMR;

D O I：

10.1103/PhysRevB.84.094402

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Al-27 nuclear spin-lattice relaxation rate 1/T-27(1) has been measured in heavy fermion superconductor NpPd5Al2 for a wide range of external fields between 0.7 and 11 T. We found that 1/T-27(1) exhibits a strong, field-dependent behavior at low fields below H similar to 3 T, which is attributed to unlike-spin cross relaxation between Np-237 and Al-27. An analysis based on the cross relaxation process allows us to make the first quantitative estimates of the Np nuclear relaxation rate 1/(237)tau in an itinerant 5f electron system. The estimated values of 1/(237)tau similar to 6 x 10(7) s(-1), with a weak temperature variation, are below the resolution of NMR relaxation times, indicating that a direct observation of the Np-237 NMR signal would be very difficult, at least in the paramagnetic state. It is proposed that a direct observation of Np-237 NMR might be possible in the superconducting state at T similar to 1 K.

引用

页数：5

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