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Fingerprints of charge ordering in anelastic spectra of underdoped La2 − xSrxCuO4

We carefully investigate the anelastic spectra of La2 − xSrxCuO4 (x = 0.02 − 0.08) from 90 to 300 K at kHz range. Two internal friction peaks are observed near 130 and 160 K, respectively, whose amplitudes demonstrate crossovers around the insulating-superconducting phase boundary (xC ∼ 0.055). The 160 K peak is of phase-like transition character and originates from the localization of diagonal charge stripes by LTO lattice and the resultant lattice adjustment. The origin of the 130 K relaxation is discussed in the framework of structural inhomogeneity as a combined result of charge inhomogeneity and electron-phonon coupling.