An explanation is given for the recent observation in the plane-site Cu nuclear quadrupole resonance (NQR) study of a heavily Zn-substituted YBa$_2$(Cu$_{ 1-x}$Zn$_x$)$_4$O$_{ 8}$ that the Cu nuclear spin-spin relaxation time $T_{ 2G}$ near the impurity Zn is longer than that away from Zn. The long $T_{ 2G}$ of the Zn-neighbor Cu nuclear spins results from a distant coupling between only a few nuclear spins near Zn, which does not indicate the absence of local enhancement of the staggered spin susceptibility around Zn.
Categories: cond-mat.supr-con cond-mat.str-el