Abstract
The spin lattice relaxation rate of La in La 1.85 Sr 0.15 CuO 4 has been measured in the temperature range 12–300K at 5.75 Teslas. A peak in the relaxation rate has been found 15K above the superconducting transition. NQR of 63,65 Cu in antiferromagnetic YBa 2 Cu 3 O 6+x for x=0.25 and x=0 is also presented. Pairs of lines corresponding to Cu[1] have been observed at 30.1–27.8 MHz for x = 0.25 and 29.9-27.6 MHz for x=0.
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