Universality and critical behavior at the critical endpoint in the itinerant-electron metamagnet UCoAl

K. Karube, T. Hattori, S. Kitagawa, K. Ishida, N. Kimura, T. Komatsubara

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We performed nuclear-magnetic-resonance measurements on itinerant-electron metamagnet UCoAl to investigate the critical behavior of the magnetism near a metamagnetic (MM) critical endpoint (CEP). We derived c-axis magnetization M c and its fluctuation S c from the measurements of Knight shift and nuclear spin-lattice relaxation rate 1/T 1 as a function of the c-axis external field (H c) and temperature (T). We developed contour plots of M c and S c on the H c-T phase diagram, and observed the strong divergence of S c at the CEP. The critical exponents of M c and S c near the CEP are estimated and found to be close to the universal properties of a three-dimensional Ising model. We indicate that the critical phenomena at the itinerant-electron MM CEP in UCoAl have a common feature as a gas-liquid transition.

Original languageEnglish
Article number024428
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number2
Publication statusPublished - Jul 23 2012
Externally publishedYes


ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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