Systematic63CuNQR study of the stripe phase inLa1.6−xNd0.4SrxCuO4for0.07<~x<~0.25

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Abstract

We demonstrate that the integrated intensity of ${}^{63}\mathrm{Cu}$ nuclear quadrupole resonance (NQR) in ${\mathrm{La}}_{1.6\ensuremath{-}x}{\mathrm{Nd}}_{0.4}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$ decreases dramatically below the charge-stripe ordering temperature ${T}_{\mathrm{charge}}.$ Comparison with neutron and x-ray scattering indicates that the wipeout fraction $F(T)$ (i.e., the missing fraction of the integrated intensity of the NQR signal) represents the charge-stripe order parameter. The systematic study reveals bulk charge-stripe order throughout the superconducting region $0.07<~x<~0.25.$ As a function of the reduced temperature $t\ensuremath{\equiv}{T/T}_{\mathrm{charge}},$ the temperature dependence of $F(t)$ is sharpest for the hole concentration $x\ensuremath{\sim}1/8,$ indicating that $x\ensuremath{\sim}1/8$ is the optimum concentration for stripe formation.

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