Combination of Dense Kondo Effect and RKKY Interaction in CeCuSb2, Investigated by NMR
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概要
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A combination of the dense Kondo effect and Ruderman–Kittel–Kasuya–Yoshida interaction exhibited by an antiferromagnetic (AF) heavy-Fermion compound CeCuSb2 (TN=8 K) was investigated with the magnetic susceptibility χ and 63Cu magnetic resonance measurements in the temperature range between 1.4 and 210 K. For temperatures above ∼25 K, characteristics of the localized 4f spins are observed in the Curie–Weiss-type behavior of the Knight shift K and the strongly enhanced relaxation rate T1-1. For the temperature below ∼25 K, the χ data tend toward a constant value, which is an indication of the onset of the heavy-Fermion state. The slope of the Knight shift versus susceptibility (K-χ) plots decreases below ∼100 K, which is ascribed to the difference in the anisotropic hyperfine coupling to the crystal-field-split Γ7 (ground state) and Γ8 (excited state) wave functions of the Ce ions. The K-χ plots below ∼25 K exhibit another deviation from the linearity in opposite direction. We speculate that this is caused by the spin polarization of the conduction electron cloud associated with the Kondo-like compensation of the Ce's 4f moment. The low-temperature increase of T1-1 is conjectured to the development of short range magnetic ordering at temperatures well above TN. Below TN, we observed a large anisotropic broadening of the resonance line and an abrupt decrease of T1-1. The experimental values of the linewidth for T≪TN and the hyperfine field give a measure of the partial moment compensation by about 23%, which can reasonably be compared with the small magnetic entropy Smag of 0.7ln2. In a related superconducting compound LaCuSb2 (TSC=0.9 K), on the other hand, both of K and (T1T)-1 for each of 63Cu and 121Sb exhibit near temperature-independent behavior of the normal Fermi liquid, and the small values are indicative of rather low density of carriers.
- 2001-12-15
著者
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Muro Yuji
Department Of Material Science Graduate School Of Science & Technology Kobe University
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Koyama Takehide
Department Of Material Science Graduate School Of Science & Technology Kobe University
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Ishikawa Masayasu
Institute For Solid State Physics The University Of Tokyo
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Wada Shinji
Department Of Material Science Graduate School Of Science & Technology Kobe University
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Matsumoto Masayuki
Department Of Cardiology Kyushu Kousei-nenkin Hospital
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Muro Yuji
Department of Material Science, Graduate School of Science & Technology, Kobe University, Nada, Kobe 657-8501
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Ishikawa Masayasu
Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581
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Wada Shinji
Department of Material Science, Graduate School of Science & Technology, Kobe University, Nada, Kobe 657-8501
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Koyama Takehide
Department of Material Science, Graduate School of Science & Technology, Kobe University, Nada, Kobe 657-8501
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Matsumoto Masayuki
Department of Material Science, Graduate School of Science & Technology, Kobe University, Nada, Kobe 657-8501
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