Superconducting-normal phase transition in (Ba1-xKx)BiO3,x=0.40, 0.47

Specific-heat measurements on (Ba1-xKx)BiO3, x = 0.40 and 0.47, 0.7 less th an or equal to T less than or equal to 35 K, 0 less than or equal to H less than or equal to 9 T, have determined the coefficient (gamma) of the norma l-state conduction electron specific heat, and shown well-defined specific- heat anomalies at T-c that are consistent with the value of gamma and BCS e xpressions. These results contradict the suggestion in a recent Letter that gamma is several orders of magnitude greater than these experimental value s and that the absence of a correspondingly large specific-heat anomaly con stitutes evidence that the transition is an Ehrenfest fourth-order transiti on.