Strong Longitudinal Magnetic Fluctuations Near Critical End Point in UCoAl: A 59Co-NMR Study
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概要
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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 T_{\text{CEP}}\sim 12 K. 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. A wide diffusion of the fluctuation from the CEP can be confirmed even in the PM state where the magnetic transition does not occur.
- 2011-09-15
著者
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Aoki Dai
Inac/spsms Cea-grenoble
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Flouquet Jacques
Inac/spsms Cea-grenoble
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KOTEGAWA Hisashi
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka Universit
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Tou Hideki
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Matsuda Tatsuma
ASRC, JAEA, Tokai, Ibaraki 319-1195, Japan
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Nohara Hiroki
Department of Physics, Kobe University, Kobe 657-8501, Japan
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Yamamoto Etsuji
ASRC, JAEA, Tokai, Ibaraki 319-1195, Japan
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Haga Yoshinori
ASRC, JAEA, Tokai, Ibaraki 319-1195, Japan
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Fisk Zachary
ASRC, JAEA, Tokai, Ibaraki 319-1195, Japan
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Ōnuki Yoshichika
ASRC, JAEA, Tokai, Ibaraki 319-1195, Japan
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