Decrease in the rate of transverse relaxation of Cu nuclei in YBa2Cu3O7-y at T<Tc
Bakharev O. N. , Zhdanov R. Sh. , Egorov A. V. , Eremin M. V., Naletov V. V., Tagirov M. S., Teplov M. A.
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.