First NMR Observation of Valence Fluctuation in Rare-Earth Compounds : ^<77>Se NMR Studies of Temperature-Activated Valence Fluctuation in Sm_3Se_4
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概要
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We have performed ^<77>Se NMR studies on a semiconducting and valence-fluctuating compound Sm_3Se_4 and a reference system Sm_2Se_3 with particular emphasis on temperature- and frequency-dependences of the nuclear transverse (1/T_2) as well as longitudinal (1/T_1) relaxation rates. 1/T_2 in Sm_3Se_4 shows a dramatic increase with decreasing temperature below 160 K, which occurs neither in 1/T_1 of Sm_3Se_4 nor in 1/T_2≅1/T_1 of Sm_2Se_3. Moreover, marked f^2-variation with the resonance frequency f has been observed in 1/T_2 of Sm_3Se_4 in this temperature range. Discussions are made on how ^<77>Se NMR can probe the valence-fluctuation (VF) phenomena, and the observed various features of ^<77>Se NMR are shown to be explained quite consistently in terms of the temperature-activated VF. As far as the present authors know, this is the first NMR observation of the VF in rare-earth compounds.
- 社団法人日本物理学会の論文
- 1993-08-15
著者
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SUZUKI Hiroyuki
Department of Oral and Maxillofacial Surgery, Hamamatsu University School of Medicine
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SUZUKI Takashi
Department of Biochemistry, University of Shizuoka, School of Pharmaceutical Sciences, Core Research
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TAKAGI Shigeru
Department of Physics,Faculty of Science,Tohoku University
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Ochiai Akira
Institute for Materials Research, Tohoku University
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Takagi Shigeru
Department Of Environmental Chemistry And Urban Planning Graduate School Of Nagoya Institute Of Tech
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Ochiai Akira
Institute For Material Resezrch Tohoku University
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Ochiai Akira
Institute For Materials Research (oarai Branch) Tohoku University
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Suzuki Takashi
Department Of Biochemistry University Of Shizuoka School Of Pharmaceutical Sciences:core Research Fo
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Suzuki Hiroyuki
Department Of Applied Physics School Of Science And Engineering Waseda University:(present Address)h
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Takagi Shigeru
Department Of Chemistry Nagoya Institute Of Technology
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Suzuki Takashi
Department Of Anatomic Pathology Tohoku University School Of Medicine
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Suzuki Hiroyuki
Department Of Animal Science Faculty Of Agriculture Hokkaido University
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