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

共 22 条

[1] Unconventional heavy-fermion superconductivity of a new transuranium compound NpPd5Al2 [J].

Aoki, Dai ;

Haga, Yoshinori ;

Matsuda, Tatsuma D. ;

Tateiwa, Naoyuki ;

Ikeda, Shugo ;

Homma, Yoshiya ;

Sakai, Hironori ;

Shiokawa, Yoshinobu ;

Yamamoto, Etsuji ;

Nakamura, Akio ;

Setta, Rikio ;

Onuki, Yoshichika .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2007, 76 (06)

[2] 27Al NMR studies of NpPd5Al2 [J].

Chudo, H. ;

Sakai, H. ;

Tokunaga, Y. ;

Kambe, S. ;

Aoki, D. ;

Homma, Y. ;

Shiokawa, Y. ;

Haga, Y. ;

Ikeda, S. ;

Matsuda, T. D. ;

Onuki, Y. ;

Yasuoka, H. .

PHYSICA B-CONDENSED MATTER, 2009, 404 (19) :3216-3219

[3] 27Al NMR evidence for the strong-coupling d-wave superconductivity in NpPd5Al2 [J].

Chudo, Hiroyuki ;

Sakai, Hironori ;

Tokunaga, Yo ;

Kambe, Shinsaku ;

Aoki, Dai ;

Homma, Yoshiya ;

Shiokawa, Yoshinobu ;

Haga, Yoshinori ;

Ikeda, Shugo ;

Matsuda, Tatsuma D. ;

Onuki, Yoshichika ;

Yasuoka, Hiroshi .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2008, 77 (08)

[4] Unconventional superconductivity in PuCoGa5 [J].

Curro, NJ ;

Caldwell, T ;

Bauer, ED ;

Morales, LA ;

Graf, MJ ;

Bang, Y ;

Balatsky, AV ;

Thompson, JD ;

Sarrao, JL .

NATURE, 2005, 434 (7033) :622-625

[5] Low-frequency spin dynamics in the CeMIn5 materials -: art. no. 227202 [J].

Curro, NJ ;

Sarrao, JL ;

Thompson, JD ;

Pagliuso, PG ;

Kos, S ;

Abanov, A ;

Pines, D .

PHYSICAL REVIEW LETTERS, 2003, 90 (22) :4-227202

[6] THEORY OF THE HALL-EFFECT IN HEAVY-FERMION COMPOUNDS [J].

FERT, A ;

LEVY, PM .

PHYSICAL REVIEW B, 1987, 36 (04) :1907-1916

[7] Transport and magnetic properties of the superconductor NpPd5Al2 [J].

Griveau, J. -C. ;

Gofryk, K. ;

Rebizant, J. .

PHYSICAL REVIEW B, 2008, 77 (21)

[8] HALL-EFFECT IN HEAVY-FERMION SYSTEMS - UPT3, UAL2, CEAL3, CERU2SI2 [J].

HADZICLEROUX, M ;

HAMZIC, A ;

FERT, A ;

HAEN, P ;

LAPIERRE, F ;

LABORDE, O .

EUROPHYSICS LETTERS, 1986, 1 (11) :579-584

[9] UGe2:: A ferromagnetic spin-triplet superconductor -: art. no. 144519 [J].

Huxley, A ;

Sheikin, I ;

Ressouche, E ;

Kernavanois, N ;

Braithwaite, D ;

Calemczuk, R ;

Flouquet, J .

PHYSICAL REVIEW B, 2001, 63 (14)

[10] Nuclear magnetic relaxation around the magnetic instabilities in metals [J].

Ishigaki, A ;

Moriya, T .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1996, 65 (10) :3402-3403

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