Atomic-level studies of superconducting and nonsuperconducting YBa2Cu3O7−x |
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Authors: | G. L. Kellogg S. S. Brenner |
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Affiliation: | (1) Sandia National Laboratories, 87185 Albuquerque, NM, USA;(2) Department of Metallurgical and Materials Engineering of the University of Pittsburgh, USA |
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Abstract: | Atomic-resolution images from superconducting and nonsuperconducting samples of YBa2Cu3O7–x have been obtained by field ion microscopy. Both phases of the material exhibit a similar layered structure in the field ion images. Transmission electron micrographs of superconducting field ion tips show vividly the twinned structure of the orthorhombic phase. Time-of-flight (atom-probe) mass spectra from the two materials differ primarily in an enhanced molecular oxygen signal from the superconducting samples indicating that oxygen in the O(4) sites (CuO chains) is field desorbed preferentially as molecular oxygen ions. |
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Keywords: | 74.70Vy 61.16Fk 79.70+g |
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