Electronic properties of high-temperature superconducting thin films grown by pulsed laser deposition

M. Abrecht; Daniel Ariosa; D. Cloetta; Giorgio Margaritondo; Davor Pavuna

doi:10.1117/12.455507

7 November 2002 Electronic properties of high-temperature superconducting thin films grown by pulsed laser deposition

M. Abrecht, Daniel Ariosa, D. Cloetta, Giorgio Margaritondo, Davor Pavuna

Proceedings Volume 4811, Superconducting and Related Oxides: Physics and Nanoengineering V; (2002) https://doi.org/10.1117/12.455507
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

We use a pulsed laser deposition (PLD) setup to grow ultra-thin films of high temperature superconductors (HTSC) and transfer them in-situ into a photoemission chamber. Photoemission measurements on such films allow us to study non-cleavable materials, but can also give insights into aspects never measured before, like the influence of strain on the low energy electronic structure. Systematic studies of many different materials grown as films showed that Bi₂Sr₂CaCu₂O_8+x, Bi₂Sr₂Cu₁O_6+x, Bi₂Sr₂Ca₂Cu₃O_10+x and La_2-xSr_xCuO₄ films exhibit a conductor-like Fermi edge, but materials containing chains (such as YBa₂Cu₃O_7-x) are prone to very rapid surface degradation, possibly related to critical oxygen loss at the surface. Among HTSC materials, La_2-xSr_xCuO₄ is extremely interesting because of its rather simple structure and the fact that its critical temperature T_c can be enhanced by epitaxial strain. Here we present our first high resolution angular resolved photoemission spectroscopy (ARPES) results on 8 unit-cell thin La_2-xSr_xCuO₄ films on SrLaAlO₄ [001] substrates. Due to the lattice mismatch, such films are compressed in the copper oxygen planes and expanded in the c-axis direction. Results show a surprisingly modified Fermi surface compared to the one of non-strained samples.

Citation Download Citation

M. Abrecht, Daniel Ariosa, D. Cloetta, Giorgio Margaritondo, and Davor Pavuna "Electronic properties of high-temperature superconducting thin films grown by pulsed laser deposition", Proc. SPIE 4811, Superconducting and Related Oxides: Physics and Nanoengineering V, (7 November 2002); https://doi.org/10.1117/12.455507

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