Open AccessHeat propagation in high T c films investigated by optical response measurements
Author(s) -
S. Zeuner,
H. Lengfellner,
J. Betz,
K. F. Renk,
W. Prettl
Publication year - 1992
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.107745
Subject(s) - thermal diffusivity , bolometer , materials science , heat transfer , thermal resistance , substrate (aquarium) , thermal , interfacial thermal resistance , film temperature , thermal conductivity , thermodynamics , analytical chemistry (journal) , composite material , optics , chemistry , physics , turbulence , oceanography , chromatography , reynolds number , detector , nusselt number , geology
The optical response of granular Tl‐Ba‐Ca‐Cu‐O films has been used to investigate thermal properties of the films. An analysis of the response using a heat transfer model yields a thermal diffusivity D=10−3 cm2/s at 150 K which rises to 6×10−3 cm2/s at a temperature of 30 K and allows for an estimation of the boundary resistance Rbd≊10−3 K cm2/W between film and substrate. The dependence of the response time on film thickness obtained from the heat transfer model is compared with published data indicating that in many experiments the observed response is mainly bolometric in origin
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