High temperature phase transition in YBa2Cu3Ox: A thermodynamic key to the high temperature superconductivity

H. K. Ng*, H. Mathias, W. G. Moulton, K. K. Pan, S. J. Pan, C. M. Rey, L. R. Testardi

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

14 Scopus citations

Abstract

A first order-like phase transition at Tp = 900°C in YBa2Cu3Ox followed by a second order transition from 900 to 600°C is found to be responsible for the high temperature superconductivity. Samples quenched from above Tp are not superconducting and have a tetragonal unit cell. Samples quenched from Tp down to 600°C show a continuously increasing and sharpening superconducting transition, and a continuously growing orthorhombic distortion. From the quenching and anneal/recovery studies we concluded that a thermodynamically inhomogeneous state occurs below Tp.

Original languageEnglish
Pages (from-to)63-66
Number of pages4
JournalSolid State Communications
Volume65
Issue number1
DOIs
StatePublished - 01 1988
Externally publishedYes

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