Frequency dispersion of nonlinear response of thin superconducting films in Berezinskii-Kosterlitz-Thouless state
| Autor: | Dietrich, Scott, Mayer, William, Byrnes, Sean, Vitkalov, Sergey, Sergeev, A., Bollinger, Anthony T., Bozovic, Ivan |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Physical Review B 91, 060506(R) (2015) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.91.060506 |
| Popis: | The effects of microwave radiation on the transport properties of atomically thin $La_{2-x}Sr_xCuO_4$ 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 $\nu_{cut} \approx$ 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 $\nu_{cut}$. The results indicate that two-dimensional superconductivity is resilient against high-frequency microwave radiation, because vortex-antivortex dissociation is dramatically suppressed in two-dimensional superconducting condensates oscillating at high frequencies. Comment: 10 pages, 12 figures |
| Databáze: | arXiv |
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