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

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. doi:10.1103/PhysRevB.47.8308.

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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.

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Yeh, N.-C.0000-0002-1826-419X
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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Office of Naval Research (ONR)N00014-91-1556
IBM-Caltech Cooperative Research FundUNSPECIFIED
Issue or Number:13
Record Number:CaltechAUTHORS:JIAprb93
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ID Code:7065
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Deposited On:07 Jan 2007
Last Modified:08 Nov 2021 20:39

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