Slow transverse relaxation of the Zn-neighbor Cu nuclear spins in YBa2(Cu1-xZnx)4O8

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An explanation is given for the recent observation in the plane-site Cu nuclear quadrupole resonance (NQR) study of a heavily Zn-substituted YBa₂(Cu₁₋ₓZnₓ)₄O₈ that the Cu nuclear spin-spin relaxation time T₂G near the impurity Zn is longer than that away from Zn. The long T₂G 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.