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Size effect of out-of-plane thermal conductivity of epitaxial YBa2Cu3O7−δ thin films at room temperature measured by photothermal radiometry
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10.1063/1.4803885
/content/aip/journal/jap/113/18/10.1063/1.4803885
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/18/10.1063/1.4803885

Figures

Image of FIG. 1.
FIG. 1.

Principle of photothermal radiometry. The one-dimensional two-layered model (layer 1 = YBCO thin film, layer 2 = MgO substrate, and backing material = acrylic resin) is applied.

Image of FIG. 2.
FIG. 2.

The present experimental apparatus based on the photothermal radiometry for the measurement of thermal conductivity of YBCO thin films.

Image of FIG. 3.
FIG. 3.

X-ray diffraction pattern of YBCO thin film (1000 nm nominal thickness) by XRD. The strong sharp peaks (001) to (007) are derived from the -axis crystal orientation. On the other hand, polycrystalline peaks (102) and (115) are not observed.

Image of FIG. 4.
FIG. 4.

Experimental results of phase lag versus frequency for YBCO thin film (1000 nm nominal thickness).

Image of FIG. 5.
FIG. 5.

Thickness dependence of the thermal conductivity of YBCO thin films in comparison with the probable range for single crystal values near room temperature. The present experimental results exhibit apparently positive film thickness dependence, and their absolute values are less than half of those for single crystal at the smallest thickness.

Image of FIG. 6.
FIG. 6.

Ratio of thermal conductivity in the -axis direction of YBCO thin films to the corresponding bulk value, , as a function of film thickness in comparison to the calculated thickness dependence curves using Eqs. (14) to (17) with the possible mean free path as an adjustable parameter. Plots are the experimental results for thin films divided by .

Tables

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Table I.

YBCO film thicknesses measured by laser microscope and their critical temperatures.

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Table II.

Optical constants of the present YBCO thin films at 790 nm.

Generic image for table
Table III.

Experimental results of out-of-plane thermal conductivity of YBCO thin films.

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/content/aip/journal/jap/113/18/10.1063/1.4803885
2013-05-09
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Size effect of out-of-plane thermal conductivity of epitaxial YBa2Cu3O7−δ thin films at room temperature measured by photothermal radiometry
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/18/10.1063/1.4803885
10.1063/1.4803885
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