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- W2034384100 abstract "We report a zero-field Cu nuclear quadrupole resonance (NQR) study on the effects of nonmagnetic Sr substitution for high-${T}_{c}$ superconductors, $mathrm{Y}({mathrm{Ba}}_{1ensuremath{-}x}{mathrm{Sr}}_{x}{)}_{2}{mathrm{Cu}}_{4}{mathrm{O}}_{8}$ ${(T}_{c}=82--80 mathrm{K},$ for $x=0ensuremath{-}0.4),$ using a spin-echo technique. The site-disordering and chemical pressure effects associated with doping Sr were observed in the broadened, shifted Cu NQR spectra. Nevertheless, the site disorder did not significantly affect the homogeneity of Cu electron spin dynamics, in contrast to the in-plane impurity. The peak shift of the Cu NQR spectrum due to Sr was different between the chain- and the plane-Cu sites, more remarkably than those under a hydrostatic physical pressure, suggesting anisotropic or nonuniform local structural strains. The small decrease of ${T}_{c}$ due to Sr can be traced back to either a cancellation effect on ${T}_{c}$ between the disorder and the pressure, or an anisotropic or nonuniform chemical pressure effect on ${T}_{c}.$" @default.
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- W2034384100 date "2001-10-19" @default.
- W2034384100 modified "2023-09-24" @default.
- W2034384100 title "Cu nuclear quadrupole resonance study of site disorder and chemical pressure effects onY(Ba1−xSrx)2Cu4O8" @default.
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- W2034384100 doi "https://doi.org/10.1103/physrevb.64.180511" @default.
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