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

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13 Citations (Scopus)


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.

Original languageEnglish
Article number053704
JournalJournal of the Physical Society of Japan
Issue number5
Publication statusPublished - 2010 May


  • Heavy fermion
  • NMR
  • NpPdAl
  • Superconductor


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