27Al Nuclear Magnetic Relaxation Studies of Spin Fluctuation in UAl2

Shigeru Takagi, Tamotsu Homma, Teiji Yoshida, Takemi Komatsubara, Tadao Kasuya

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12 Citations (Scopus)

Abstract

The microscopic magnetic properties of UA12 have been invetigated by 27A1 NMR from 1.5 to 500 K. The observed T-dependence of 1/T1 indicates a cross-over from higher-T local-moment-like behavior to lower-T Fermi-liquid behavior with a characteristic spin fluctuation (SF) temperature T*≍100 K. Above T*, a characteristic energy-scale of the SF is found to be large and to increase almost linearly with temperature, indicating both strong hybridization between 5f and conduction electrons and the dominance of single-site dynamics in the U-moment relaxation at higher temperatures. Below T*, a development of significant q-dependence of the SF with decreasing temperature is concluded from the analysis of T1 in connection with previous neutron measurements. Based on the observed proportionality between an increase of 1/(T1T) and that of χ below 40 K, the onset of a ferromagnetic correlation, in addition to an only weakly q-dependent single-site fluctuation with a larger energy-scale, is suggested at lower temperatures.

Original languageEnglish
Pages (from-to)1097-1104
Number of pages8
Journaljournal of the physical society of japan
Volume60
Issue number3
DOIs
Publication statusPublished - 1991 Mar

Keywords

  • 27Al NMR
  • UA12
  • nuclear magnetic relaxation
  • spin fluctuation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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