Absence of discontinuities in ion-channeling parameters for YBa2 Cu3O7−δ thin films
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CitationHecker, N. E., R. Haakenaasen, J. A. Golovchenko, J. F. Chervinsky, and C. B. Eom. 1997. Absence of Discontinuities in Ion-Channeling Parameters for YBa2 Cu3O7−δ Thin Films. Physical Review B 55, no. 2: R700–R703. doi:10.1103/physrevb.55.r700.
AbstractWe have measured the ion-channeling minimum yield (χmin) and angular width (Ψ1/2) for Y, Ba, Cu, and O in 2000 Å (001)-oriented films of YBa2Cu3O7−δ on MgO. The measurements mapped out a 30 K region around the critical temperature (Tc) in 1–2 K steps, and Tc was determinednin situ. A O16(α,α)16O resonance was used to study the O motions. χmin increases and Ψ1/2 decreases with increasing temperature for all elements, as expected for a smooth increase in vibration amplitude. We see no anomalous jumps in either parameter, which differs from previous reports on YBa2Cu3O7−δ bulk single crystals.
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