Jiang, W. and Yeh, N.-C. and Reed, D. S. and Kriplani, U. and Tombrello, T. A. and Rice, A. P. and Holtzberg, F. (1993) Vortex-solid melting and depinning in superconducting Y-Ba-Cu-O single crystals irradiated by 3-MeV protons. Physical Review B, 47 (13). pp. 8308-8311. ISSN 0163-1829 http://resolver.caltech.edu/CaltechAUTHORS:JIAprb93
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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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|Deposited On:||07 Jan 2007|
|Last Modified:||26 Dec 2012 09:28|
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