Evidence for Ferromagnetic Fluctuations in Filled Skutterudite LaFe_4Sb_<12>:Sb-NQR and La-NMR(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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We report the results of ^<121, 123>Sb-nuclear quadrupole resonance (NQR) and ^<139>La-NMR measurements on a filled skutterudite antimonide LaFe_4Sb_<12> in order to investigate the magnetic properties at low temperatures from a microscopic point of view. The nuclear spin-lattice relaxation time T_1 of Sb nuclei deviates from the relation T_1T=constant above 4.2K, where 1/T_1T has a Curie-Weiss temperature dependence 1/T_1T=C/(T+θ) with θ〜30K. The temperature dependence of the Knight shift of ^<139>La nuclei, which is related to the susceptibility at q=0, is scaled to that of 1/T_1T above 40K. This relation strongly suggests that ferromagnetic fluctuations are predominant in LaFe_4Sb_<12>. We also point out that LaFe_4Sb_<12> is situated close to the ferromagnetic instability due to the small Weiss temperature in the Curie-Weiss behavior of 1/T_1T and the Knight shift.
- 社団法人日本物理学会の論文
- 2006-02-15
著者
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SUGAWARA Hitoshi
Faculty of Integrated Arts and Sciences, The University of Tokushima
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ISHIDA Kenji
Department of Physics, Graduate School of Science, Kyoto University
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Mamiya K
Department Of Physics Tokyo Metropolitan University
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MAGISHI Ko-ichi
Faculty of Integrated Arts and Sciences, The University of Tokushima
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KOYAMA Kuniyuki
Faculty of Integrated Arts and Sciences, The University of Tokushima
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NAKAI Yusuke
Department of Physics, Graduate School of Science, Kyoto University
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Saito T
Faculty Of Engineering Kyushu Institute Of Technology
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Mori Ikuko
Faculty Of Integrated Arts And Sciences The University Of Tokushima
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Kawashima Miho
Synchrotron Radiation Research Center Japan Atomic Energy Agency:(present Office)ulvac-phi Inc.
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Sugawara Hitoshi
Faculty Of Engineering Iwate University
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Shiozawa Hidetsugu
Department Of Physics Tokyo Metropolitan University
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SAITO Takahito
Faculty of Integrated Arts and Sciences, The University of Tokushima
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Koyama Kuniyuki
Faculty Of Engineering Tokushima University
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Ishida Kenji
Department Of Physics Graduate School Of Science Kyoto University
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Ishida Kenji
Department Of Orthopaedic Surgery Kochi Medical School
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Sugawara H
Faculty Of Engineering Iwate University
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Mori I
Faculty Of Engineering The University Of Tokushima
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Nakai Yusuke
Department Of Materials Science And Engineering Graduate School Of Engineering Nagoya Institute Of T
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Koyama K
Faculty Of Engineering Yamagata University
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Saito Takahito
Faculty Of Integrated Arts And Sciences The University Of Tokushima
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Sakata H
Department Of Physics Tokyo Institute Of Technology
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MAGISHI Koichi
Faculty of Integrated Arts and Sciences, The University of Tokushima
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Magishi Koichi
Faculty Of Integrated Arts And Sciences The University Of Tokushima
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Ishida Kenji
Department Of Chemical Science And Engineering Graduate School Of Engineering Kobe University
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MORI Ikuko
Faculty of Integrated Arts and Sciences, The University of Tokushima
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Ishida Kenji
Department of Applied Chemistry, Ibaraki University
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