Abstract
Precise magnetization measurements of single crystals have found evidence for a bulk phase transition a few degrees below the superconducting critical temperature. The phase transition is indicated by a sudden drop of the lower critical field, (T), separating a full coherent state at low fields and temperatures, the Meissner state, from a region at higher temperatures where magnetic excitations are induced at H=0.
- Received 12 December 1990
DOI:https://doi.org/10.1103/PhysRevB.43.13610
©1991 American Physical Society