TY - JOUR
T1 - The use of low temperature scanning microscope for estimating in-plane thermal diffusivity in YBCO thin film
AU - Matsekh, A.
AU - Kiss, T.
AU - Inoue, M.
AU - Yoshizumi, M.
AU - Sutoh, Y.
AU - Izumi, T.
AU - Shiohara, Y.
N1 - Funding Information:
Manuscript received August 27, 2008. First published June 05, 2009; current version published July 15, 2009. This work was supported in part by the New Energy and Industrial Technology Development Organization (NEDO) as Collaborative Research and Development of Fundamental Technologies for Superconductivity Applications, Project for Development of Materials & Power Application of Coated Conductors, M-PACC and also by JSPS: KAKENHI (20360143).
PY - 2009/6
Y1 - 2009/6
N2 - We have experimentally investigated thermal diffusion in a SrTiO 3 based YBCO bicrystalline thin-film by means of one-dimensional low temperature scanning microscope (LTLSM). Grain boundary (GB) being a weak link is temperature sensitive, thus it can be used as a local thermal sensor. In experiments DC bias current was higher than the GB critical current, but much lower than the intra-grain one. At 10 Hz modulation frequency the detected GB trace was found to be about 300 micrometers. Upon the frequency increase, the trace diminishes and for 200 kHz was about 10 micrometers. Theoretical analysis shows that thermal length varies inversely as the square root of the frequency, and phase delay is in direct proportion. We have shown phase delay between modulating and response signals to be in a good agreement with theoretical frequency dependence. Effective thermal dif- fusivity coefficient calculated from the above dependence is close to that of the and indicates that heat diffusion is much influenced by the substrate. Hence this result demonstrates the potential of the LTLSM for obtaining effective in-plane thermal diffusivity of multilayered superconducting tapes and films.
AB - We have experimentally investigated thermal diffusion in a SrTiO 3 based YBCO bicrystalline thin-film by means of one-dimensional low temperature scanning microscope (LTLSM). Grain boundary (GB) being a weak link is temperature sensitive, thus it can be used as a local thermal sensor. In experiments DC bias current was higher than the GB critical current, but much lower than the intra-grain one. At 10 Hz modulation frequency the detected GB trace was found to be about 300 micrometers. Upon the frequency increase, the trace diminishes and for 200 kHz was about 10 micrometers. Theoretical analysis shows that thermal length varies inversely as the square root of the frequency, and phase delay is in direct proportion. We have shown phase delay between modulating and response signals to be in a good agreement with theoretical frequency dependence. Effective thermal dif- fusivity coefficient calculated from the above dependence is close to that of the and indicates that heat diffusion is much influenced by the substrate. Hence this result demonstrates the potential of the LTLSM for obtaining effective in-plane thermal diffusivity of multilayered superconducting tapes and films.
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U2 - 10.1109/TASC.2009.2017712
DO - 10.1109/TASC.2009.2017712
M3 - Article
AN - SCOPUS:68649109797
SN - 1051-8223
VL - 19
SP - 2867
EP - 2871
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 3
M1 - 5067242
ER -