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VOLUME 47 (1988) | ISSUE 9 | PAGE 451
Fine structure in NQR spectra of copper in YBa2Cu3O6.0+x
Fine structure has been observed in the nuclear-quadrupole-resonance spectra of copper in the Cu2 position in YBa2Cu3Oe 0 _t л compounds (x = 0.0-0.95). This fine structure apparently reflects a sensitivity of the resonant frequency to the extent to which oxygen atoms preferentially fill 04 positions. The intensity redistribution among the various lines with increasing^ indicates an increase in the number of pairs of 04 oxygen atoms as the composition goes into the superconducting region.