Macroscopic quantum effect based on no-field quantum Hall effect found in electric properties of low-doped c-oriented LaSrCuO film crystal

摘要

We study the film-thickness dependence of parallel toc dielectric polarization of La1.95Sr0.05CuO4 thin film crystal, and find the existence of special film thicknesses where the polarization reveals a large amplitude alternate change with sign change. At the special thicknesses, we find interference patterns in the polarization-charge dependence of the film capacitance. With the use of small area device, We observe in the film the quantum resonance between the current-induced oscillation and coherent electromagnetic wave of microwaves (10 GHz), the CO2 laser (10.6 mum), and the He-Ne laser (3.39 mum). A theoretical study based on the no-field quantum Hall effect is made to explicate these effects. [References: 9]