M. Saintpaul et al., MAGNETIC-FIELD DEPENDENCE OF ULTRASOUND VELOCITY IN YBA2CU3O7 AND BI2SR2CACU2O8, Physica. C, Superconductivity, 235, 1994, pp. 2084-2085
Magnetic field dependence of ultrasound velocity in YBa2Cu3O7 single c
rystals and Bi2Sr2CaCu2O8 textured samples is reported. The high (MHz)
and the low (Hz) frequency elastic behaviours of the flux line lattic
e are compared. The very small frequency dependence observed in a larg
e frequency range is not related easily to a simple model of thermal a
ctivation.