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We report a zero-field Cu nuclear quadrupole resonance (NQR) study on theeffects of nonmagnetic Sr substitution for high-Tc superconductors,Y(Ba1-xSrx)2Cu4O8 (Tc=82-80 K for x=0-0.4), using a spin-echo technique. Thesite-disordering and chemical pressure effects associated with doping Sr wereobserved in the broadened, shifted Cu NQR spectra. Nevertheless, the sitedisorder did not significantly affect the homogeneity of Cu electron spindynamics, in contrast to the in-plane impurity. The peak shift of Cu NQRspectrum due to Sr was different between the chain- and the plane-Cu sites,more remarkably than those under a hydrostatic physical pressure, suggestinganisotropic or nonuniform local structural strains. The small decrease of Tcdue to Sr can be traced back to either a cancellation effect on Tc between thedisorder and the pressure, or an anisotropic or nonuniform chemical pressureeffect on Tc.Comment: 4 pages, 5 figure

physical review. b, condensed matter

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Cu nuclear quadrupole resonance study of site disorder and chemical pressure effects onY(Ba1−xSrx