HYDROGEN-DOPED ANTIFERROMAGNETIC YBA2CU3O7-DELTA-HX AS STUDIED BY PROTON NMR AND CU NQR

Proton NMR and Cu NQR of the Cu(1) site have been measured on the anti ferromagnetic phase of a powdered sample of hydrogen-doped tetragonal YBa2Cu3O6.1H0.14 between 5 and 300 K. The line width, DELTAomega, of H -1 NMR increases abruptly below 20 K. The enhancement of T2(-1) and th at of T1(-1) of Cu-63 (1) NQR occurs around 20 K and 40 K, respectivel y. The nuclear magnetization does not recover in a simple exponential manner below 80 K. The predominant mechanism governing T1 below 80 K w as found to be the fluctuating magnetic field which originates from th e staggered Cu2+ moments in either the Cu(1) oxygen-deficient layer or the Cu(2)O2 plane induced by the hole doping effect. These enhancemen ts and the abrupt increase in DELTAomega are attributed to this fluctu ating magnetic field.