Frequency dispersion of nonlinear response of thin superconducting films in the Berezinskii-Kosterlitz-Thouless state
Scott Dietrich, William Mayer, Sean Byrnes, Sergey Vitkalov, A. Sergeev, Anthony T. Bollinger, Ivan Božović
DOI 10.1103/PhysRevB.91.060506 · Physical Review B
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Abstract
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 νcut≈2GHz. 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 νcut. 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.72Sr0.28CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | unknown |
| La1.80Sr0.20CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure not reported | unknown |
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