Ap. Saiko et al., ON THEORY OF THE TEMPERATURE HYSTERESIS OF ULTRASONIC WAVE VELOCITY IN HIGH-T-C CUPRATES, Physica. C, Superconductivity, 235, 1994, pp. 1239-1240
It is shown that the bistable behavior of the sublattice formed by api
cal oxygen atoms O(4) in the high-T-c,compounds YBa2Cu3O7-x, BiSr2Ca1C
u2O8 is responsible for the experimentally observed hysteresis of ultr
asonic wave velocity.