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Anisotropic spin fluctuations in heavy-fermion superconductor NpPd$$_5$$Al$$_2$$

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

We present $$^{27}$$Al 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 NpPd$$_5$$ Al$$_2$$ ($$T$$$$_{rm c}$$ = 4.9 K). We report here that 1/$$T$$$$_1$$ shows a large anisotropy with a different temperature dependence for $$H$$ $$parallel$$ $$a$$ and $$H$$ $$parallel$$ $$c.$$ 1/$$T$$$$_1$$ for $$H$$ $$parallel$$ $$c$$ shows a power-law temperature dependence $$sim$$$$T$$$$^{0.38}$$, while 1/$$T$$$$_1$$ for $$H$$ $$parallel$$ $$a$$ shows a $$T$$-linear dependence at low temperatures in fields well above $$H$$$$_{rm c2}$$. From the analysis of 1/$$T$$$$_1$$, $$XY$$-type anisotropy of AFM spin fluctuations is found to become prominent below 20 K.

Language

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English

Journal

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Journal of the Physical Society of Japan

Volume

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79

Number

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5

Pages

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p.053704_1 - 053704_4

Publication Year/Month

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2010/05

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Patent information

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PDF

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Paper URL

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https://doi.org/10.1143/JPSJ.79.053704

DOI for research data

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Keywords

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no keyword

Research Facility

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Press Release

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Article of JAEA R&D Review

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Cooperating Institute

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Accesses

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- Accesses

InCites™

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Percentile:59.61

Category:Physics, Multidisciplinary

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