Abstract
In the superconducting La 2CuO 4+d, Cu NQR signals were observed at around 33.1 and 36.0 MHz together with the antiferromagnetic Cu NMR signals similar to those in La 2CuO 4. The NQR intensity on oxygen-loaded samples increases with increasing the loaded contents, d, of oxygen. The nuclear spin relaxation time, T 1, of Cu NQR indicates that the paramagnetic phase is in the superconducting state. La NMR was also measured to study microscopically a phase-separation and magnetic behaviors in oxygen-loaded La 2CuO 4+d.
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