Analysis of Nuclear Relaxation Experiments in High T_c Oxides Based on Mila-Rice Hamiltonian
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Nuclear relaxation experiments of "Cu, "0 and "Y NQR/NMR in high T. oxideshave been analyzed within the frame of a phenomenological model proposed by Milaand Rice, supposing that only one spin freedom exists. It was shown quantitativelythat "(I /T.), "(I /T.) and the approximate 7'-linear behavior of "(1 7T.) at highertemperatures can be associated with the same d-spin fluctuations around q -0. Theanisotropy data of "(1 / T.) were also explained consistently, from which the values ofhyperfine coupling constants were determined. The contribution of antiferromagneticd-spin fluctuations to "(1 / T.) was extracted from raw data without any adjustableparameters. The saturated value of it above - 150 K is by an order of magnitudelower than that estimated in a localized moment scheme. A possible interplay betweenmagnetism and superconductivity is also discussed.[NMR, NQR, high 7'.superconductivity, t -./model, nuclear spin-lattice relaxa- ll tion rate 1 / T., spin fluctuationsl
- 社団法人日本物理学会の論文
- 1990-07-15
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- Analysis of Nuclear Relaxation Experiments in High T_c Oxides Based on Mila-Rice Hamiltonian