Abstract
The observation of Cu-NQR in La2−xSrxCuO4 revealed that the spectra were splitted into two peaks at low temperatures and that its separation decreased with increasing x. This fact indicates that the well-defined hyperfine field due to magnetic ordering of Cu moments exists in the superconducting and normal metallic regions. The nuclear spin-lattice relaxation rate, 1/T1 of the Cu spectra is suppressed apparently by the superconducting energy gap for x≦0.20, while its temperature dependence obeys the Korringa relation for the normal region of x≧0.25. The nuclear spin-spin relaxation rate, 1/T2 increases proportionally with increasing hyperfine field, indicating the dominant indirect unclear spin coupling via virtual excitation of antiferromagnetic spin waves. The coexistence of superconductivity and the magnetic order of Cu d-electrons with a tiny moment is demonstrated by the NQR study in the La-Sr-Cu-O system
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