Ferromagnetic critical behavior in U(Co1-xFex)Al (0≤x≤0.02) studied by Co 59 nuclear quadrupole resonance measurements FERROMAGNETIC CRITICAL BEHAVIOR in U(Co ... K. KARUBE, T. HATTORI, K. ISHIDA, and N. KIMURA

K. Karube, T. Hattori, K. Ishida, N. Kimura

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6 Citations (Scopus)

Abstract

In order to investigate physical properties around a ferromagnetic (FM) quantum transition point and a tricritical point (TCP) in the itinerant-electron metamagnetic compound UCoAl, we have performed the Co59 nuclear quadrupole resonance (NQR) measurement for the Fe-substituted U(Co1-xFex)Al(x=0,0.5,1,and2%) in zero external magnetic field. The Fe concentration dependence of Co59-NQR spectra at low temperatures indicates that the first-order FM transition occurs at least above x=1%. The magnetic fluctuations along the c axis detected by the nuclear spin-spin relaxation rate 1/T2 exhibit an anomaly at Tmax∼20K and enhance with increasing x. These results are in good agreement with theoretical predictions and indicate the presence of prominent critical fluctuations at the TCP in this system.

Original languageEnglish
Article number075131
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number7
DOIs
Publication statusPublished - 2015 Feb 26

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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