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Stimulation of superconductivity by microwave radiation in wide tin films (Review Article)
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10.1063/1.4813655
/content/aip/journal/ltp/39/7/10.1063/1.4813655
http://aip.metastore.ingenta.com/content/aip/journal/ltp/39/7/10.1063/1.4813655

Figures

Image of FIG. 1.
FIG. 1.

A series of current-voltage characteristics of the film sample SnW5 at  = 3.745 K and  = 12.89 GHz for various levels of radiation power: the radiation power is zero (), with increasing a serial number of the CVC the radiation power increases ().

Image of FIG. 2.
FIG. 2.

The dependence of the relative critical current ()/(0) in the sample Sn1 on the reduced microwave radiation power / at  = 3.812 K for different radiation frequencies , GHz: 15.4 (▲), 8.1 (●), 3.7 (▪) ((0) is the critical current of the film at  = 0; is the minimum power of electromagnetic radiation at which () = 0).

Image of FIG. 3.
FIG. 3.

The reduced value of exceeding the maximum critical current () over (0) as a function of the radiation frequency for the samples Sn1(▲), SnW10 (▪) and SnW5 (●) at  = / ≈ 0.99; the values of lower cutoff frequencies of superconductivity stimulation calculated by Eq. (11) for the samples Sn1 , SnW10 and SnW5 .

Image of FIG. 4.
FIG. 4.

The dependence of the relative critical current ()/(0) in the sample SnW10 on the reduced microwave radiation power / at  = 3.777 K for different radiation frequencies , GHz: 12.91 (▪), 6.15 (●), 0.63 (▼); dashed curve is the dependence ()/(0) (/) calculated by Eq. (21) .

Image of FIG. 5.
FIG. 5.

The dependence of the relative critical current ()/(0) in the sample SnW5 on the reduced microwave radiation power / at  = 3.744 К for different radiation frequencies , GHz: 15.2 (▲), 11.9 (●), 9.2 (▪), 5.6 (▼). The dashed curve is the dependence ()/(0) (/) calculated by Eq. (21) .

Image of FIG. 6.
FIG. 6.

The dependence of the relative critical current ()/(0) on the reduced microwave radiation power / with the frequency  = 9.2 GHz at  = / ≈ 0.99 in different samples: SnW5 (▲), SnW6 (●) and SnW10 (▪).

Image of FIG. 7.
FIG. 7.

A region of external radiation power Δ/, where the effect of stimulation of the critical current is observed, as a function of the film width for the frequency of 9.2 GHz at / ≈ 0.99.

Image of FIG. 8.
FIG. 8.

The dependence of the critical current (▪) and the maximum current of existence of the vortex resistivity (●) for the sample SnW5 on the reduced microwave power / with the frequency  = 12.89 GHz at  = 3.748 K. The inset shows an enlarged fragment of the above-mentioned dependencies.

Image of FIG. 9.
FIG. 9.

The experimental temperature dependence of the critical currents ( = 0) (▪), ( = 9.2 GHz) (●), and ( = 12.9 GHz) (▼) for the sample SnW10. The theoretical dependence mA calculated by Eq. (19) , (curve ); calculated dependence mA (curve ); theoretical dependence mA calculated by Eq. (27) , (straight line ); theoretical dependence ( = 9.2 GHz) calculated by Eq. (16) and fitting dependence mA (curve ); theoretical dependence ( = 12.9 GHz) calculated by Eq. (16) , and fitting dependence mA (curve ); theoretical dependence ( = 9.2 GHz) calculated by Eq. (16) normalized by the curve , and fitting dependence mA (curve ); calculated dependence mA (straight line ).

Image of FIG. 10.
FIG. 10.

The experimental temperature dependencies of the critical currents ( = 0) (▪), ( = 15.2 GHz) (▲) for the sample SnW8: calculated dependence () = 1.0 × 10(1 − /) mA (curve ); theoretical dependence mA calculated by Eq. (27) , (straight line ); theoretical dependence ( = 15.2 GHz) calculated by Eq. (16) normalized by the curve , and fitting dependence () = 1.0 × 10(1 − /3.835) mA (curve ); calculated dependence () = 1.72 × 10(1 − /3.835) mA (straight line ).

Image of FIG. 11.
FIG. 11.

The experimental temperature dependencies of the maximum current of existence of stationary uniform flow of intrinsic vortices of transport current across the film SnW5: (, = 0) (●), (▼) and (▲). Curve is the theoretical dependence (see Eq. (23) ); curve is the calculated dependence (see Eq. (24) ); curve is the calculated dependence (see Eq. (26) ).

Image of FIG. 12.
FIG. 12.

The calculated dependencies of the equilibrium (curve ) and stimulated by microwave field the gap for the sample SnW5 (curve ,  = 9.2 GHz; curve ,  = 15.2 GHz).

Tables

Generic image for table
Table I.

Parameters of tin film samples.

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/content/aip/journal/ltp/39/7/10.1063/1.4813655
2013-07-01
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Stimulation of superconductivity by microwave radiation in wide tin films (Review Article)
http://aip.metastore.ingenta.com/content/aip/journal/ltp/39/7/10.1063/1.4813655
10.1063/1.4813655
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