Ca Doped YBCO Films in THz Frequency range

E Färber¹, N Bachar^1,2, 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 T_c is approached. The imaginary part of the conductivity was found to be proportional to 1/ω, known from the delta-function response.

for 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