Laser heating of YBa{sub 2}Cu{sub 3}O{sub 7} films in Raman experiments
Journal Article
·
· Physical Review, B: Condensed Matter
- Institut fuer Angewandte Physik und Zentrum fuer Mikrostrukturforschung, Universitaet Hamburg, Jungiusstrasse 11, D-20355 Hamburg (Germany)
Magnetron-sputtered and laser-deposited YBa{sub 2}Cu{sub 3}O{sub 7} films on MgO(100) substrates are investigated in a Raman setup. We prepare 25-{mu}m-wide microbridges using standard photolithography and argon-ion-beam etching. The change of critical currents of illuminated microbridges is used to determine the spot temperature with high accuracy. The thermal boundary resistance of magnetron-sputtered YBa{sub 2}Cu{sub 3}O{sub 7} films on MgO(100) is determined to be {ital R}{sub bd}=(76{plus_minus}9)/{ital T}{sup 3} K{sup 4} cm{sup 2} W{sup {minus}1} and {ital R}{sub {ital b}{ital d}}=(1.7{plus_minus}0.2){times}10{sup {minus}3} K cm{sup 2} W{sup {minus}1} for temperatures below and above 35 K, respectively. In order to obtain the spot temperature also Stokes and anti-Stokes Raman spectra are taken. The accuracy of this method, however, is only {plus_minus}10 K and {plus_minus}30 K at low and high laser power densities, respectively. At room temperature Raman measurements with increasing laser power densities are performed until oxygen rearrangements and finally oxygen loss in the Cu(1)-O(1) chains are observed. By analyzing the spot temperatures in these measurements and comparing with recent oxygen diffusion experiments we show that both the rearrangement and the oxygen loss are thermally activated processes.
- OSTI ID:
- 54953
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 21 Vol. 51; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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