Hydrogen-doped Antiferromagnetic YBa2Cu3O7-δHx as Studied by Proton NMR and Cu NQR

Abstract

Abstract of the C u(l) site have been measured on the antiferromagnetic phase of a powdered sample of hydrogen-doped tetragonal YBa2Cu3O6.1H0.14 between 5 and 300 K. The line width, Δω, of 1H NMR increases abruptly below 20 K. The enhancement of T2 -1 and that of T1 -1 of 63Cu (1) NQR occurs around 20 K and 40 K, respectively. The nuclear magnetization does not recover in a simple exponential manner below 80 K. The predominant mechanism governing T1 below 80 K was found to be the fluctuating magnetic field which originates from the staggered Cu2+ moments in either the Cu(l) oxygen-deficient layer or the Cu(2)O2 plane induced by the hole doping effect. These enhancements and the abrupt increase in Δω are attributed to this fluctuating magnetic field.