Anisotropic spin fluctuations in the heavy fermion systems: Case studies of CePd5Al2 and NpPd5Al2

Hironori Sakai, Hiroyuki Chudo, Yo Tokunaga, Shinsaku Kambe, Yoshinori Haga, Filip Ronning, Eric D. Bauer, Joe D. Thompson, Yoshiya Homma, Dai Aoki, Yasunori Nakano, Fuminori Honda, Rikio Settai, Yoshichika Onuki

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5 Citations (Scopus)

Abstract

In the so-called 115 family members with chemical formulae of CeTIn 5 (T=Co, Rh, Ir) and AnTGa5 (An=U, Np, Pu), our analysis of the Knight shift and spin-lattice relaxation rates suggests that larger XY-type anisotropy in the antiferromagnetic spin fluctuations in the normal states would favor dwave superconductivity with higher Tc. In order to examine this working hypothesis, the anisotropy ratios of antiferromagnetic fluctuations are derived from our NMR results for the superconductor NpPd 5Al2 and antiferromagnet CePd5Al2, which are tetragonal compounds with a 115-related structure. CePd 5Al2 shows Ising-type anisotropy, which is the same anisotropy as in the ordered state. On the other hand, NpPd5Al 2 shows XY-type anisotropy just above Tc.

Original languageEnglish
Article numberSB003
JournalJournal of the Physical Society of Japan
Volume81
Issue numberSUPPL.B
Publication statusPublished - 2012 Sep 1

Keywords

  • Antiferromagnetic spin fluctuations
  • Magnetic anisotropy
  • Nuclear magnetic resonance
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Sakai, H., Chudo, H., Tokunaga, Y., Kambe, S., Haga, Y., Ronning, F., Bauer, E. D., Thompson, J. D., Homma, Y., Aoki, D., Nakano, Y., Honda, F., Settai, R., & Onuki, Y. (2012). Anisotropic spin fluctuations in the heavy fermion systems: Case studies of CePd5Al2 and NpPd5Al2. Journal of the Physical Society of Japan, 81(SUPPL.B), [SB003].