Title :
High Resolution Thermal Imaging of Hotspots in Superconducting Films
Author :
Haugen, O. ; Johansen, T.H. ; Chen, H. ; Yurchenko, V. ; Vase, P. ; Winkler, D. ; Davidson, B.A. ; Testa, G. ; Sarnelli, E. ; Altshuler, E.
Author_Institution :
Dept. of Phys., Oslo Univ., Oslo
fDate :
6/1/2007 12:00:00 AM
Abstract :
Thermal imaging of hotspots in bridge structures of YBaCuO thin films is presented with micrometer resolution. Hotspots formed by passing transport currents are observed using a method based on the temperature dependence in the photoluminescence of a polymer thin film deposited on the superconductor. The hotspots are self maintained and have hysteretic behavior. An external magnetic field changes their behavior. The temperature distribution over the bridge and in its vicinity can be observed with a resolution better than 0.1 K. Also details of the experimental method will be reported.
Keywords :
barium compounds; high-temperature superconductors; infrared imaging; photoluminescence; polymer films; superconducting thin films; yttrium compounds; YBaCuO; bridge structures; external magnetic field; high resolution thermal imaging; hotspots; photoluminescence; polymer thin film; superconducting thin films; temperature dependence; temperature distribution; transport currents; Bridges; High-resolution imaging; Image resolution; Magnetic hysteresis; Photoluminescence; Polymer films; Superconducting films; Superconducting thin films; Temperature dependence; Yttrium barium copper oxide; Bridge; YBCO; hotspot; transport current;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2007.899341
