Frequency dispersion of nonlinear response of thin superconducting films in the Berezinskii-Kosterlitz-Thouless state

Article

关键词: 2-DIMENSIONAL SYSTEMS;    PHASE-TRANSITIONS;    TEMPERATURE;    SUPERFLUID;    LA2-XSRXCUO4;   

DOI  :  10.1103/PhysRevB.91.060506

来源: SCIE

【 摘 要 】

The effects of microwave radiation on the transport properties of atomically thin La2-xSrxCuO4 films were studied in the 0.1-13 GHz frequency range. Resistance changes induced by microwaves were investigated at different temperatures near the superconducting transition. The nonlinear response decreases by several orders of magnitude within a few GHz of a cutoff frequency nu(cut) approximate to 2 GHz. Numerical simulations that assume an ac response to follow the dc V - I characteristics of the films reproduce well the low-frequency behavior, but fail above.cut. The results indicate that two-dimensional (2D) superconductivity is resilient against high-frequency microwave radiation, because vortex-antivortex dissociation is dramatically suppressed in 2D superconducting condensates oscillating at high frequencies.

【 授权许可】

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