Abstract
High-quality films of both the body-centered and primitive tetragonal phases of ErRh/sub 4/B/sub 4/ have been made by dc sputtering. Critical fields perpendicular and parallel to these films have been measured. The major result of this research is the interpretation of these measurements for the reentrant superconducting primitive phase. It is concluded that a type-II to type-I transition occurs as temperature T falls below about 2.4 K. In this way the large apparent discrepancy between parallel and perpendicular critical fields can be understood as being due to the intermediate state. The analysis also indicates that the superconducting condensation energy E/sub c/ is non-BCS and falls to a low value at the reentrant transition. However, it is necessary to extrapolate Landau parameters for the magnetic normal state to determine E/sub c/, so that this conclusion is not definite. The critical field at the upper transition temperature is reported to have an anomalous, and as yet unexplained, temperature dependence.
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