Abstract
The title compound has recently been found to exhibit two superconducting transitions at 2 and 7.5 K when annealed at 100--120 K at ambient pressure. We have investigated the development of the two phases as a function of annealing time (at 104 K) by complex susceptibility measurements. At the initial stage of annealing, both the 2- and 7.5-K superconducting phases appear, but, with further annealing, the 7.5-K transition grows to a considerable fraction of the complete diamagnetism. The present results suggest that the 7.5-K phase is the most stable state at ambient pressure. The profile of the evolution is discussed in terms of both the real and imaginary parts of the susceptibility.
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