Simulation of below-gap photoresponse of thin-film superconductors by Josephson-junction arrays
Y. Cai, P. L. Leath, Z. Yu
DOI 10.1103/PhysRevB.49.4015 · Physical Review B
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Abstract
The below-gap, nonbolometric photoresponse of granular, thin-film superconductors seen recently by Strom et al. and by other experimental groups is simulated by a numerical study of the dc voltage response to an applied ac current at finite temperature, by ordered and disordered two-dimensional arrays of resistively shunted Josephson junctions. The current-assisted random generation of vortex-antivortex pairs by the temperature fluctuations and the ac current is observed. The photoresponse for perfect arrays shows a large peak at the Kosterlitz-Thouless transition TKT which moves to lower temperature with increasing Idc or Iac. For randomly diluted, disordered arrays at p=0.9 (10% of the junctions removed) the peak in the photoresponse is greatly enhanced and moved to lower temperatures. The behavior of the photoresponse versus bias current, ac power, and frequency is reported. A simple model of random localized heating is tried as a numerical approach to explain some features of the above-gap photoresponse.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| NbN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| NbN/BN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| BaPb0.7Bi0.3O3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CaCuO8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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