Electron subsystem superheating as a cause of nonlinear current-voltage characteristics of amorphous InOx films

Golubkov, M. V.; Tsydynzhapov, G. E.

doi:10.1134/1.1307479

Cited by 8 publications

(8 citation statements)

References 6 publications

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“…We note similarities of our results with those of Golubkov et al [21] in In 2 O 3 . They suggested that electron heating was dominant on the insulating side of the perpendicular field tuned transition with θ = 5.…”

supporting

confidence: 91%

Hot-electron effects in the two-dimensional superconductor-insulator transition

2006

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The parallel magnetic field tuned two-dimensional superconductor-insulator transition has been investigated in ultrathin films of amorphous Bi. The resistance is found to be independent of temperature on both sides of the transition below approximately 120 mK. Several observations suggest that this regime is not intrinsically "metallic" but results from the failure of the films' electrons to cool. The onset of this temperature-independent regime can be moved to higher temperatures by either increasing the measuring current or the level of electromagnetic noise. Temperature scaling is successful above 120 mK. Electric field scaling can be mapped onto temperature scaling by relating the electric fields to elevated electron temperatures. These results cast doubt on the existence of an intrinsic metallic regime and on the independent determination of the correlation length and dynamical critical exponents obtained by combining the results of electric field and temperature scaling.

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supporting

confidence: 91%

Hot-electron effects in the two-dimensional superconductor-insulator transition

2006

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“…In addition, the electric field scaling analysis in the case of InO x thin films 34 was reported to be successful, although θ was about 6 35 . Nevertheless, the same scaling in InO x failed with even smaller θ exponent of 5 36 . In addition, the electric field scaling in Bi thin films reported the product of ν ( z + 1 ) bigger than the expected value 37 .…”

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confidence: 84%

Scaling analysis of field-tuned superconductor–insulator transition in two-dimensional tantalum thin films

Park

Shin

Kim

2017

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The superconductor–insulator (SI) transition in two-dimensional Ta thin films is investigated by controlling both film thickness and magnetic field. An intriguing metallic phase appears between a superconducting and an insulating phase within a range of film thickness and magnetic field. The temperature and electric field scaling analyses are performed to investigate the nature of the SI transition in the thickness-tuned metallic and superconducting samples. The critical exponents product of νz obtained from the temperature scaling analysis is found to be approximately 0.67 in the entire range of film thickness. On the other hand, an apparent discrepancy is measured in the product of ν(z + 1) by the electric filed analysis. The product values are found to be about 1.37 for the superconducting films and about 1.86 for the metallic films respectively. We find that the discrepancy is the direct consequence of electron heating that introduces additional dissipation channels in the metallic Ta films.

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“…Heat-balance analysis. We next demonstrate, using the heatbalance approach (Equation (1)), that the I-V's are well described in terms of electron self-heating [12][13][14][15][22][23][24] . Inspecting Equation 1we see that the only unknown variable is T el , which we need to obtain independently.…”

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confidence: 99%

“…2a to effective T el and plot the results in Fig. 2b 20,23,25 (see Supplementary Note 3 for a detailed description of the heatbalance analysis).…”

Section: Resultsmentioning

confidence: 99%

The critical current of disordered superconductors near 0 K

et al. 2020

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An increasing current through a superconductor can result in a discontinuous increase in the differential resistance at the critical current. This critical current is typically associated either with breaking of Cooper-pairs or with the onset of collective motion of vortices. Here we measure the current-voltage characteristics of superconducting films at low temperatures and high magnetic fields. Using heat-balance considerations we demonstrate that the current-voltage characteristics are well explained by electron overheating enhanced by the thermal decoupling of the electrons from the host phonons. By solving the heat-balance equation we are able to accurately predict the critical currents in a variety of experimental conditions. The heat-balance approach is universal and applies to diverse situations from critical currents to climate change. One disadvantage of the universality of this approach is its insensitivity to the details of the system, which limits our ability to draw conclusions regarding the initial departure from equilibrium.

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Electron subsystem superheating as a cause of nonlinear current-voltage characteristics of amorphous InOx films

Cited by 8 publications

References 6 publications

Hot-electron effects in the two-dimensional superconductor-insulator transition

Hot-electron effects in the two-dimensional superconductor-insulator transition

Scaling analysis of field-tuned superconductor–insulator transition in two-dimensional tantalum thin films

The critical current of disordered superconductors near 0 K

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