Frequency-dependent terahertz conductivity of La1.85Sr 0.15CuO4 thin film was investigated. The imaginary part of the complex conductivity, σ2(T,ω), considerably increased at T<30K. This result suggests that the superconducting fluctuation by charge with short lifetime exists only near the superconducting transition temperature, and takes place separately with the spin fluctuation observed by the Nernst signal measurement.
- Cuprate superconductor
- Terahertz conductivity
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering