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Strong Longitudinal Magnetic Fluctuations Near Critical End Point in UCoAl: A59Co-NMR Study

  • Author(s): Nohara, Hiroki
  • Kotegawa, Hisashi
  • Tou, Hideki
  • D. Matsuda, Tatsuma
  • Yamamoto, Etsuji
  • Haga, Yoshinori
  • Fisk, Zachary
  • Ōnuki, Yoshichika
  • Aoki, Dai
  • Flouquet, Jacques
  • et al.

We report 59Co-NMR measurements in UCoAl where metamagnetism occurs owing to the enhancement of ferromagnetism by a magnetic field. The metamagnetic transition from a paramagnetic (PM) state to a ferromagnetic state is a first-order transition at low temperatures, but it changes to a crossover at high temperatures on crossing the critical end point (CEP) at Tcep ∼ 12 K. The contrasting behavior between the relaxation rates 1/T 1 and 1/T2 suggests that the longitudinal magnetic fluctuation of the U moments is strongly enhanced, especially near the CEP. A wide diffusion of the fluctuation from the CEP can be confirmed even in the PM state where the magnetic transition does not occur. © 2011 The Physical Society of Japan.

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