POSSIBLE VIBRONIC ORIGIN OF HIGH-TC SUPERCONDUCTIVITY - NONCUPRATE HIGH TCS

Recent experimental findings on the T, = 34 K superconductor Kaz-,K,BiO3 are analyzed to show that the maximum BCS-like T, for this system is much higher than previously estimated for vibronic T,'s. On this basis it is argued that a purely vibronic origin for high T, has to be reconsidered. Furthermore, an outline prescription is given for the production of high T, (w 100 K) bismuthates without copper. © 1990, Taylor & Francis Group, LLC. All rights reserved.