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Session B12 - HTSC: MAGNETIC PENETRATION DEPTH MEASUREMENTS
mixed session, Monday morning, March 20, 11:00
Room C1, San Jose Convention Center
We have utilized a novel broadband measurement technique ^1 to investigate the finite frequency contribution of thermodynamic fluctuations to the total conductivity of YBCO thin films both above and below T _c . Our measurements of both the real and imaginary parts of the temperature dependent complex resistivity indicate that the contribution to the total conductivity due to fluctuations decreases as the measurement frequency is increased, which is in qualitative agreement with the theory of H. Schmidt. The effect of sample inhomogeneity on the measured resistivity is also considered. We present the results of detailed fits of the temperature dependence of the complex resistivity at DC and various frequencies in the range 45 MHz to 45 GHz, and discuss the role of sample dimensionality in the fluctuation conductivity of layered superconductors. ^1 J.C. Booth et. al, Rev. Sci. Instrum. \bf65, 2082 (1994). Supported by the NSF NYI program (DMR-9258183).
