| Popis: |
Measurements of the nonlinear susceptibility, irreversibility onset, and relaxation of the remanent magnetization are reported for a single-crystal sample of YTbat. %. The data give strong support for the existence of a spin-glass phase transition for spin components in the basal plane, but not for those along the c axis. A scaling analysis of the nonlinear susceptibility leads to the values delta = 3.2 +- 0.2 and phi = 3.0 +- 0.2 for the field and cross-over exponents, respectively. These values are consistent with the position of the de Almeida--Thouless line observed below the freezing temperature. |
