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論文

Pressure evolution of the metamagnetic transition in UCoAl As measured using $$^{59}$$Co NMR

小手川 恒*; 野原 弘貴*; 藤 秀樹*; 松田 達磨; 山本 悦嗣; 芳賀 芳範; Fisk, Z.; 大貫 惇睦; 青木 大*; Flouquet, J.*

Journal of the Korean Physical Society, 63(3), p.341 - 344, 2013/08

https://doi.org/10.3938/jkps.63.341
 被引用回数：1 パーセンタイル：11.42(Physics, Multidisciplinary)

NMR measurements under pressure were preformed on the quantum critical endpoint (QCEP) of the metamagnetic transition in UCoAl. $$^{59}$$Co-NMR sensitively detects the evolution of the internal field caused by applying the external field. The loss of the NMR signal on approaching the QCEP indicates the development of spin fluctuations.

論文

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

野原 弘貴*; 小手川 恒*; 藤 秀樹*; 松田 達磨; 山本 悦嗣; 芳賀 芳範; Fisk, Z.; 大貫 惇睦; 青木 大*; Flouquet, J.*

Journal of the Physical Society of Japan, 80(9), p.093707_1 - 093707_4, 2011/09

https://doi.org/10.1143/JPSJ.80.093707
 被引用回数：21 パーセンタイル：72.3(Physics, Multidisciplinary)

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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