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Cu(1) NQR spectra of the CuO chain site in Y 1 _ x Pr x Ba 2 Cu 3 O 7  (x = 0.1 and 0.2), and the  63 Cu(1) NQR spin-lattice relaxation rates 1/T 1  in Y 0.9 Pr 0.1 Ba 2 Cu 3 O 7  have been measured. The half widths are about three times wider than those of the pure YBa 2 Cu 3 O 7  . The peak frequencies are lowered by the Pr doping. This seems to indicate a decrease of on-site holes at the Cu(1) site. The relaxation rate 1/T 1  is found to obey the same temperature dependence, 1/T 1  = aT + bT 3  as reported for pure YBa 2 Cu 3 O 7 .

Cu(1) NQR in Y 1 _ x Pr x Ba 2 Cu 3 O 7