THE VORTEX LATTICE-DYNAMICS IN THE HIGH-T-C SUPERCONDUCTOR TLBA2CA2CU3O9

A TlBa2Ca2Cu3O9(Tl-1223) superconductor (T-c=116 K) has been synthesiz ed by using solid state reaction method and AC susceptibility was meas ured. Since the flux line lattice dynamics has been especially interes ting topics in the critical current density, we measured the frequency dependence of the susceptibility in the range 1 kHz less than or equa l to omega/2 pi less than or equal to 2 MHz and compared it with vario us models. The experimental results of the vortex dynamics could be we ll fitted by the diffuse model. The behavior of the flux line means a flux diffusive motion and an ohmic motion at the low magnetic field.