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Published April 1, 1993 | Published
Journal Article Open

Vortex-solid melting and depinning in superconducting Y-Ba-Cu-O single crystals irradiated by 3-MeV protons

Abstract

Compositionally modulated thin films of Cu and Y were prepared in an ultrahigh-vacuum dc ion-beam deposition chamber. The amorphization reaction was monitored by in situ x-ray-diffraction measurements. Growth of amorphous Cu1-xYx is observed at room temperature with the initial formation of a Cu-rich amorphous phase. Further annealing in the presence of unreacted Y leads to Y enrichment of the amorphous phase. Growth of crystalline CuY is observed for T=469 K. Transmission-electron-microscopy measurements provide real-space imaging of the amorphous interlayer and growth morphology. Models are developed, incorporating metastable interfacial and bulk free-energy diagrams, for the early stage of the amorphization reaction.

Additional Information

© 1993 The American Physical Society Received 14 December 1992 We thank Nils Asplund for his technical assistance. This work is jointly supported by ONR Grant No. N00014-91-1556, NASA/OAET, IBM-Caltech Cooperative Research Fund, and NSF Grant No. DMR90-11230.

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