Low-energy oxygen ion-beam assisted growth of BaO/EuBa2Cu3O7-delta multilayers in ultrahigh vacuum

Govind Pindoria; K. Kawaguchi; Tadataka Morishita

doi:10.1117/12.250245

5 July 1996 Low-energy oxygen ion beam assisted growth of BaO/EuBa₂Cu₃O_7-δmultilayers in ultrahigh vacuum

Govind Pindoria, K. Kawaguchi, Tadataka Morishita

Proceedings Volume 2697, Oxide Superconductor Physics and Nano-Engineering II; (1996) https://doi.org/10.1117/12.250245
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

Molecular beam epitaxial growth of cuprate oxide superconducting thin films using a mass separated, low energy, O⁺ beam source, is discussed. The mono-valent O⁺ ion is chemically, highly reactive, and its kinetic energy at 10's of electron volts, is significant. It allows the growth of REBa₂Cu₃O_7-(delta ) (REBCO) thin films at low pressures and temperatures. The effective over-pressure of the O⁺ ions at the substrate being 2 X 10^-7 Torr, and the optimum growth temperature 500 degrees C. These conditions are below the currently accepted stability line for the growth of REBCO thin films. We characterize the physical and chemical properties of the O⁺ ion beam, and its effect on superconducting thin films. We have grown highly crystalline BaO and EuBa₂Cu₃O_7-(delta ) (EBCO) thin films on SrTiO₃ substrates. The full width at half maximum of the rocking curves for BaO(002) equals 0.07 degrees and that for the EBCO (005) peak equals 0.05 degrees. Also, we found that BaO is a good insulating material (1.7 X 10¹³ (Omega) m at 4K), with an excellent lattice match to EBCO, therefore a suitable candidate as an insulating layer in multilayer structures. The results of the first growth studies of BaO/EBCO multilayers are discussed.

Citation Download Citation

Govind Pindoria, K. Kawaguchi, and Tadataka Morishita "Low-energy oxygen ion beam assisted growth of BaO/EuBa₂Cu₃O_7-δmultilayers in ultrahigh vacuum", Proc. SPIE 2697, Oxide Superconductor Physics and Nano-Engineering II, (5 July 1996); https://doi.org/10.1117/12.250245

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