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

Research output: Contribution to journalArticlepeer-review

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 (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
Volume79
Issue number5
DOIs
Publication statusPublished - 2010 May

Keywords

  • Heavy fermion
  • NMR
  • NpPdAl
  • Superconductor

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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