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- W1973872086 abstract "Anelastic spectra and 139 La NQR relaxation measurements have been carried out in La 2 - x Sr x CuO 4 (LSCO) for x around the critical value x c = 0.02 separating the antiferromagnetic (AF) from the cluster spin glass (CSG) phase for T → 0. The anelastic spectra around 10 K show step-like features common to samples pertaining to both AF and CSG phases. In the light of recent neutron scattering measurements suggesting that the spin-glass phase of LSCO with x < x c corresponds to a microscopic phase separation between regions with x ~ 0 and x ~ 0.02, the rise of the elastic energy dissipation has been attributed to the movement of the domain walls within the x ≃ x c CSG regions. The spin dynamics driving the AF transition has been investigated by means of 139 La NQR relaxation rate. The in-plane magnetic correlation length ξ 2D has been extracted. In spite of the vicinity to the percolation threshold, ξ 2D (x = 0.016, T) follows the temperature behavior expected in the renormalized classical regime, with spin stiffness reduced to about 0.4 of the one in pure La 2 CuO 4 . Still, the 3D transition occurs when ξ 2D is of the order of about 150 lattice steps, as in pure La 2 CuO 4 , possibly related to the presence of AF regions unaffected by the holes." @default.
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- W1973872086 date "2003-03-10" @default.
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- W1973872086 title "ANELASTIC SPECTROSCOPY AND NQR RELAXATION IN Sr-DOPEN La2CuO4 AROUND THE AF PERCOLATION THRESHOLD" @default.
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- W1973872086 doi "https://doi.org/10.1142/s0217979203016169" @default.
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