Fingerprints of charge ordering in anelastic spectra of underdoped
National Laboratory of Solid State Microstructures and Physics Department
Nanjing University - Nanjing 210093, PRC
Accepted: 1 April 2002
We carefully investigate the anelastic spectra of LaSrxCuO4 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 . 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.
PACS: 74.25.Ld – Mechanical and acoustical properties, elasticity, and ultrasonic attenuation / 63.20.Kr – Phonon-electron and phonon-phonon interactions / 74.72.Dn – La-based cuprates
© EDP Sciences, 2002