In the vortex-liquid state in YBa2Cu3O7 there exist two distinct dissipative states separated by a field Hk. Below Hk, the resistivity is strongly field activated, with a prefactor that is anomalously enhanced over the normal-state resistivity N by 12 orders of magnitude. At Hk, the prefactor collapses to a temperature-independent value equal to N, and the vortex motion becomes diffusive. The existence of the Hk boundary is also reflected in the anomalous behavior of the Hall resistivity.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)