Vibrational Pseudo-Diffusive Motion of the Oxygen Octahedra in La2CuO4 from Anelastic and 139La Quadrupolar Relaxation (original) (raw)

Selected Topics in Superconductivity, 2002

Abstract

ABSTRACT The vibrational dynamics in nearly stoichiometric La2CuO4+δ is studied by means of anelastic and 139La NQR relaxation. After lowering δ to values of the order of 0.001, a relaxational peak remains in both the anelastic and NQR spectra with a mean relaxation time τ=1.7×10−12 exp[(2800 K)/T]s. Such a process is attributed to the motion of CuO6 octahedra in doublewell potentials whose cooperative character increases the effective energy barrier to the observed value. It is speculated that the freezing of the motion of the octahedra may correspond to the locking of the stripes.

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