Thermal boundary resistance and diffusivity for YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} films

Journal Article · Mon May 01 04:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.51.11903· OSTI ID:44554

Zeuner, S; Lengfellner, H; Prettl, W ^[1]

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1. Institut fuer Angewandte Physik, Universitaet Regensburg, D-93040 Regensburg (Germany)

We have measured the thermoelectric response of off-{ital c}-axis epitaxial YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} films with thicknesses between 35 and 500 nm using laser pulses at uv and IR wavelengths. Due to the anisotropy of the thermopower in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}, these off-{ital c}-axis films show a voltage response proportional to the average temperature gradient in the film which provides a sensitive probe of the temperature distribution within the film. A comparison of the experimetnal data and calculations with a thermal model for films with different thicknesses, allows us to extract the diffusivity of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} and the thermal boundary resistance of the film-substrate boundary. Irradiating the films through the substrate leads to a situation where heat flow in the interfacial region dominates. The shape of the voltage signals depends strongly on the value assumed for the thermal boundary resistance. A consistent description for both illumination directions is found only in a narrow range around {ital R}{sub bd}{approx}0.5{times}10{sup {minus}3} K cm{sup 2}/W.

• OSTI ID: 44554
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 17 Vol. 51; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BARIUM OXIDES
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
SUPERCONDUCTING FILMS
THERMAL BOUNDARY RESISTANCE
THERMAL DIFFUSIVITY
THERMOELECTRIC PROPERTIES
YTTRIUM OXIDES