Thomas H. Baum, Carl E. Larson, et al.
Journal of Organometallic Chemistry
We report the first measurement of the energy gap of the high-temperature bismuth oxide superconductor Ba0.6K0.4BiO3 (Tc30 K). With temperature- and magnetic-field-dependent infrared reflectivity measurements, we obtain a reduced energy gap of 2/kTc3.50.5, consistent with a BCS-type mechanism with moderate or weak coupling. In the normal state a broad peak in the infrared conductivity is observed near 5000 cm-1. This unusual infrared behavior is common to both the BaPb1-xBixO3 and the Ba1-xKxBiO3 systems and may provide a fundamental clue to the mechanism of superconductivity in the cubic bismuth oxides. © 1989 The American Physical Society.
Thomas H. Baum, Carl E. Larson, et al.
Journal of Organometallic Chemistry
Ranulfo Allen, John Baglin, et al.
J. Photopolym. Sci. Tech.
L.K. Wang, A. Acovic, et al.
MRS Spring Meeting 1993
C.M. Brown, L. Cristofolini, et al.
Chemistry of Materials