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Tetragonal-orthorhombic phase transition in YBaCuO thin films observed by perturbed angular correlation spectroscopy

Published online by Cambridge University Press:  31 January 2011

R. Platzer ,
I. D. Dumkow ,
D. W. Tom ,
J. A. Gardner  and
J. Tate
R. Platzer
Affiliation:
Department of Physics and Center for Advanced Materials Research, Oregon State University, Corvallis, Oregon 97331–6507
I. D. Dumkow
Affiliation:
Department of Physics and Center for Advanced Materials Research, Oregon State University, Corvallis, Oregon 97331–6507
D. W. Tom
Affiliation:
Department of Physics and Center for Advanced Materials Research, Oregon State University, Corvallis, Oregon 97331–6507
J. A. Gardner
Affiliation:
Department of Physics and Center for Advanced Materials Research, Oregon State University, Corvallis, Oregon 97331–6507
J. Tate
Affiliation:
Department of Physics and Center for Advanced Materials Research, Oregon State University, Corvallis, Oregon 97331–6507
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Abstract

Oxygen-deficient, tetragonal thin films of YBa2Cu3O6+x with x ≈ 0.25, quenched from the deposition temperature, change to the oxygenated, orthorhombic phase with x ≈ 1, between 200 °C and 400 °C in flowing oxygen. The transition is not reversible in flowing oxygen, and cannot be completely reversed by cooling in flowing argon. We do not observe a transition of the orthorhombic films to the tetragonal phase up to 800 °C in flowing oxygen. We observe that the major impurity phases to appear under nonoptimal annealing conditions are oriented phases of YcuO2 and BaCu2O2, with Y2BaCu2O5 and Y2Cu2O5 conspicuously absent. These conclusions have been drawn from a study that uses perturbed angular correlation spectroscopy to probe the local microstructure of the films.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 4 , April 1998 , pp. 947 - 953
Copyright
Copyright © Materials Research Society 1998

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