Kinetic Inductance and Penetration Depth of Thin Superconducting Films Measured by THz Pulse Spectroscopy
S. D. Brorson, R. Buhleier, J. O. White, I. E. Trofimov, H. -U. Habermeier, J. Kuhl
Abstract
We measure the transmission of THz pulses through thin films of YBCO at temperatures between 10K and 300K. The pulses possess a useable bandwidth extending from 0.1 -- 1.5 THz (3.3 cm-1 -- 50 cm-1). Below Tc we observe pulse reshaping caused by the kinetic inductance of the superconducting charge carriers. From transmission data, we extract values of the London penetration depth as a function of temperature, and find that it agrees well with a functional form (λ(0)/λ(T))2 = 1 - (T/Tc)α, where λ(0) = 148 nm, and α= 2. *****Figures available upon request*****
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