Low-Energy Magnetic Excitations in the Antiferromagnetically Ordered State of an Incipient Heavy-Electron Compound UP as Studied by ^<31>P NMR
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概要
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The microscopic magnetic properties of UP with the cubic NaCl-type structure have been investigated by ^<31>P NMR in the magnetically ordered state. 1/T_1 is extraordinarily large in the single-Q type-I Phase (T_0≅ 22.5 K<T<T_N=122K), and shows about two orders of magnitude abrupt decrease through the single-Q↔ double-Q phase transition at T_0. Below about 4 K in the double-Q type-I phase (T<T_0), 1/T_1 shows a Korringa-like temperature-dependence, which corresponds qualitatively to a 5f derived γT term in the specific heat. We discuss this behavior as a clear indication of the existence of 5f-derived very-low-energy magnetic excitations even in the ordered state, and an incipient heavy-electron character of the compound is concluded. We also present a simple qualitative model of a system of exchange-coupled Kondo impurities under internal exchange (or molecular) field in order to discuss the origin of these excitations.
- 社団法人日本物理学会の論文
- 1994-12-15
著者
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Takagi Shigeru
Department Of Environmental Chemistry And Urban Planning Graduate School Of Nagoya Institute Of Tech
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Takagi Shigeru
Department Of Chemistry Nagoya Institute Of Technology
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Takagi Shigeru
Department of Applied Chemistry, Faculty of Engineering, Osaka University
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