Friday, 4 January 2013

Ca Doped YBCO Films in THz Frequency range


E Färber1, N Bachar1,2, H Castro3, E Zhukova4 and B Gorshunov4

1 Laboratory for Superconductivity and Optical Spectroscopy, Ariel University Center of Samaria 40700, Israel
2 School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Science, Tel Aviv University Ramat Aviv 69978, Israel
3 Physics Department, National University of Colombia, Bogota, Colombia
4 Submillimeter Spectroscopy Department, Russian Academy of Sciences, Moscow, Russia 

J. Phys.: Conf. Ser. 400 022018 doi:10.1088/1742-6596/400/2/022018

Abstact
Ca doped YBaCuO thin films were investigated using frequency and time domain THz spectroscopy. A non-monotonic behavior was observed in with a maximum at about 1.8 meV and 1.2 meV depending on Ca concentration. Two batches of thin films 500–600Å thick where used; one of 5% and the other of 10% Ca concentration. The films show a clear c-axis orientation and 77K for the 5% Ca and 10% Ca respectively. Both thin film batches show a decrease in plasma frequency as temperature increases and superconducting transition is approached. The quasiparticles scattering rate decreases in the normal state and drops when Tc is approached. The imaginary part of the conductivity was found to be proportional to 1/ω, known from the delta-function response.


TPS Spectra 300for full paper see http://iopscience.iop.org/1742-6596/400/2/022018/pdf/1742-6596_400_2_022018.pdf

......TeraView, time domain spectrometer, a complex transmission function was obtained directly........



For more information about the Spectra 3000 used for these measurements see http://www.teraview.com/products/index.html