Anisotropic Spin Fluctuations in Heavy-Fermion Superconductor NpPd5Al2

被引：12

作者：

Chudo, Hiroyuki ^{[1
]}

Sakai, Hironori ^{[1
]}

Tokunaga, Yo ^{[1
]}

Kambe, Shinsaku ^{[1
]}

Aoki, Dai ^{[2
]}

Homma, Yoshiya ^{[2
]}

Haga, Yoshinori ^{[1
]}

Matsuda, Tatsuma D. ^{[1
]}

Onuki, Yoshichika ^{[1
,3
]}

Yasuoka, Hiroshi ^{[1
]}

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] Osaka Univ, Grad Sch Sci, Osaka 5600043, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2010年 / 79卷 / 05期

基金：

日本学术振兴会;

关键词：

NpPd5Al2; superconductor; heavy fermion; NMR; NUCLEAR MAGNETIC-RELAXATION; ANTIFERROMAGNETIC METALS; UPT3;

D O I：

10.1143/JPSJ.79.053704

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present Al-27 NMR measurements of the Knight shift and nuclear spin-lattice relaxation rate 1/T-1 in the normal state for a single crystal of the heavy-fermion superconductor NpPd5Al2 (T-c = 4.9 K). We report here that 1/T-1 shows a large anisotropy with a different temperature dependence for H parallel to a and H parallel to c. 1/T-1 for H parallel to c shows a power-law temperature dependence similar to T-0.38, while 1/T-1 for H parallel to a shows a T-linear dependence at low temperatures in fields well above H-c2. From the analysis of 1/T-1, XY-type anisotropy of AFM spin fluctuations is found to become prominent below 20 K.

引用

页数：4

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