Anisotropic spin fluctuations in heavy-fermion superconductor NpPd 5Al2

Hiroyuki Chudo; Hironori Sakai; Yo Tokunaga; Shinsaku Kambe; Dai Aoki; Yoshiya Homma; Yoshinori Haga; Tatsuma D. Matsuda; Yoshichika Onuki; Hiroshi Yasuoka

doi:10.1143/JPSJ.79.053704

Anisotropic spin fluctuations in heavy-fermion superconductor NpPd ₅Al₂

Hiroyuki Chudo, Hironori Sakai, Yo Tokunaga, Shinsaku Kambe, Dai Aoki, Yoshiya Homma, Yoshinori Haga, Tatsuma D. Matsuda, Yoshichika Onuki, Hiroshi Yasuoka

IMR - Materials Processing and Characterization Division

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13 Citations (Scopus)

Abstract

We present ²⁷Al NMR measurements of the Knight shift and nuclear spin-lattice relaxation rate 1/T₁ in the normal state for a single crystal of the heavy-fermion superconductor NpPd₅Al₂ (T_c = 4.9 K). We report here that 1/T₁ shows a large anisotropy with a different temperature dependence for H ∥ a and H ∥ c. 1/T₁ for H ∥ c shows a power-law temperature dependence ∼ T_0.38, while 1/T₁ for H ∥ a shows a T-linear dependence at low temperatures in fields well above H_c2. From the analysis of 1/T₁, XY-type anisotropy of AFM spin fluctuations is found to become prominent below 20 K.

Original language	English
Article number	053704
Journal	Journal of the Physical Society of Japan
Volume	79
Issue number	5
DOIs	https://doi.org/10.1143/JPSJ.79.053704
Publication status	Published - 2010 May

Keywords

Heavy fermion
NMR
NpPdAl
Superconductor

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10.1143/JPSJ.79.053704

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title = "Anisotropic spin fluctuations in heavy-fermion superconductor NpPd 5Al2",

abstract = "We present 27Al NMR measurements of the Knight shift and nuclear spin-lattice relaxation rate 1/T1 in the normal state for a single crystal of the heavy-fermion superconductor NpPd5Al2 (Tc = 4.9 K). We report here that 1/T1 shows a large anisotropy with a different temperature dependence for H ∥ a and H ∥ c. 1/T1 for H ∥ c shows a power-law temperature dependence ∼ T0.38, while 1/T1 for H ∥ a shows a T-linear dependence at low temperatures in fields well above Hc2. From the analysis of 1/T1, XY-type anisotropy of AFM spin fluctuations is found to become prominent below 20 K.",

keywords = "Heavy fermion, NMR, NpPdAl, Superconductor",

author = "Hiroyuki Chudo and Hironori Sakai and Yo Tokunaga and Shinsaku Kambe and Dai Aoki and Yoshiya Homma and Yoshinori Haga and Matsuda, {Tatsuma D.} and Yoshichika Onuki and Hiroshi Yasuoka",

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T1 - Anisotropic spin fluctuations in heavy-fermion superconductor NpPd 5Al2

AU - Chudo, Hiroyuki

AU - Sakai, Hironori

AU - Tokunaga, Yo

AU - Kambe, Shinsaku

AU - Aoki, Dai

AU - Homma, Yoshiya

AU - Haga, Yoshinori

AU - Matsuda, Tatsuma D.

AU - Onuki, Yoshichika

AU - Yasuoka, Hiroshi

PY - 2010/5

Y1 - 2010/5

N2 - We present 27Al NMR measurements of the Knight shift and nuclear spin-lattice relaxation rate 1/T1 in the normal state for a single crystal of the heavy-fermion superconductor NpPd5Al2 (Tc = 4.9 K). We report here that 1/T1 shows a large anisotropy with a different temperature dependence for H ∥ a and H ∥ c. 1/T1 for H ∥ c shows a power-law temperature dependence ∼ T0.38, while 1/T1 for H ∥ a shows a T-linear dependence at low temperatures in fields well above Hc2. From the analysis of 1/T1, XY-type anisotropy of AFM spin fluctuations is found to become prominent below 20 K.

AB - We present 27Al NMR measurements of the Knight shift and nuclear spin-lattice relaxation rate 1/T1 in the normal state for a single crystal of the heavy-fermion superconductor NpPd5Al2 (Tc = 4.9 K). We report here that 1/T1 shows a large anisotropy with a different temperature dependence for H ∥ a and H ∥ c. 1/T1 for H ∥ c shows a power-law temperature dependence ∼ T0.38, while 1/T1 for H ∥ a shows a T-linear dependence at low temperatures in fields well above Hc2. From the analysis of 1/T1, XY-type anisotropy of AFM spin fluctuations is found to become prominent below 20 K.

KW - Heavy fermion

KW - NMR

KW - NpPdAl

KW - Superconductor

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Anisotropic spin fluctuations in heavy-fermion superconductor NpPd ₅Al₂

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Keywords

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