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Strong longitudinal magnetic fluctuations near critical end point in UCoAl; A $$^{59}$$Co-NMR study

Nohara, Hiroki*; Kotegawa, Hisashi*; To, Hideki*; Matsuda, Tatsuma; Yamamoto, Etsuji ; Haga, Yoshinori ; Fisk, Z.; Onuki, Yoshichika; Aoki, Dai*; Flouquet, J.*

We report $$^{59}$$Co-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 $$T_{rm CEP}$$ $$sim$$ 12K. The contrasting behavior between the relaxation rates $$1/T_1$$ and $$1/T_2$$ suggests that the longitudinal magnetic fluctuation of the U moments is strongly enhanced, especially near the CEP.

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Category:Physics, Multidisciplinary

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