Oxygen Content Dependence of Nuclear Resonance Spectrum in Tetragonal YBa2Cu3Ox

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Abstract
The dependence of the resonance profiles for 63 Cu and 65 Cu on the oxygen content, x , in YBa 2 Cu 3 O x (6.1≤ x ≤6.4) was investigated systematically. The measurements were performed for two different sites, the Cu-O 2 plane site (Cu(2)) and the Cu-O chain site (Cu(1)), at the liq. He temperature. The NQR spectrum corresponding to the Cu(1) sites consists of three different spectra. Their relative intensities change systematically with increasing x . Some discussions are made on the oxygen coordination, the spectral shift and the line broadening. The quadrupolar-split NMR spectra associated with the Cu(2) sites were obtained in x ≤6.3. Although the magnetic line broadening becomes significant, no spectral shift was observed with the increase of x . This means that the magnetic moment on the Cu(2) site in the antiferromagnetic state does not change, at least until x =6.3.