We investigate microwave complex conductivity of La2-xSr xCuO4 under finite magnetic fields by broadband technique, and analyze the result from the two alternative viewpoints; (1) superconductivity fluctuation, and (2) vortex motion. For higher fields, conventional scaling relation between conductivity and frequency does not hold. We propose a new "scaling" relation for these data. On the other hand, vortex picture works even in the vortex liquid state. However, a strange behavior of superfluid density indicates that the vortex picture alone cannot explain the whole behavior even just above the first order transition line.
- Microwave conductivity
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering