Superconductivity

E. Kaldis, P. Fischer, A.W. Hewat, E.A. Hewat, J. Karpinski, S. Rusiecki, "Low temperature anomalies and pressure: effects on the structure and Tc of the superconductor YBa2Cu4O8 (Tc = 80 K)," Physica C, 159, 668-80, 15 July 1989. Emanuel Kaldis (Laboratory of Solid State Physics ETH, Zurich, Switzerland): "With this experiment it became evident that the contraction of the apical bond (Cu2--O1) is correlated with the substantial increase of Tc under hydrostatic pressure, which we had found ear

The Scientist Staff
Dec 9, 1990

E. Kaldis, P. Fischer, A.W. Hewat, E.A. Hewat, J. Karpinski, S. Rusiecki, "Low temperature anomalies and pressure: effects on the structure and Tc of the superconductor YBa2Cu4O8 (Tc = 80 K)," Physica C, 159, 668-80, 15 July 1989.

Emanuel Kaldis (Laboratory of Solid State Physics ETH, Zurich, Switzerland): "With this experiment it became evident that the contraction of the apical bond (Cu2--O1) is correlated with the substantial increase of Tc under hydrostatic pressure, which we had found earlier at Zurich. This demonstrated clearly that minute structural changes of the Y-Ba-Cu-O phases may have a very important influence on the physical properties. These findings also directly supported the ideas of K. Alex Müller (IBM, Zurich)20about the importance of the apical bond. Our experiment is a particularly clean one, because in contrast to the 123 phase, which shows a similar effect under the influence of oxygen nonstoichiometery, here no chemical parameters affecting...