Strong Longitudinal Magnetic Fluctuations Near Critical End Point in UCoAl: A 59Co-NMR Study
作者： Hiroki Nohara , Hisashi Kotegawa , Hideki Tou , Tatsuma D. Matsuda , Etsuji Yamamoto
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摘要: 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 paramagnetic (PM) state ferromagnetic is first-order at low temperatures, but it changes crossover high temperatures on crossing critical end point (CEP) T CEP ∼12 K. contrasting behavior between relaxation rates 1/ 1 and 2 suggests that longitudinal fluctuation U moments strongly enhanced, especially near CEP. A wide diffusion can be confirmed even PM does not occur.
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