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VOLUME 47 (1988) | ISSUE 8 | PAGE 383
Decrease in the rate of transverse relaxation of Cu nuclei in YBa2Cu3O7-y at T<Tc
Pulsed nuclear quadrupole resonance method was used to measure the uniform width of the 63Cu lines in the ceramic compound YBa2Cu307 _ y {y^O. 1) at temperatures from 10 К to 200 K. The contraction of the NQR line of the copper atoms situated in the Cu-O planes, which was observed at T< Tc, is attributed to the formation of Си3 + — Cu3+ hole pairs due to the antiferromagnetic superexchange interaction.