Probing superconducting granularity using nonlocal four-probe measurements

Poláčková, Magdaléna; Zhitlukhina, Elena; Belogolovskii, Mikhail; Gregor, M.; Pleceník, T.; Seidel, P.

doi:10.1140/epjp/s13360-023-04123-w

Cited by 5 publications

(6 citation statements)

References 21 publications

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“…3) are shown below. As was explained in our recent paper 24 (cf. "Methods" section), occasionally, it leads to spurious features as resistance near-Tc peaks seen in some curves shown in Figs 2 and 3.…”

Section: Non-local Transport Characteristics Of Nbn Films In Magnetic...mentioning

confidence: 68%

“…Such contact arrangement made it possible to carry out non-local four-probe measurements which, as was argued by us in Ref. 24, strongly enhance sensitivity to inhomogeneity factors and make related experiments on superconducting films the method of choice for knowing the spatial distribution of a superconducting order parameter and at the same time to get more reliable information about universal transport features, which are not dependent on the local properties of the samples.…”

Section: Sample Preparationmentioning

confidence: 96%

“…"Methods" section), occasionally, it leads to spurious features as resistance near-Tc peaks seen in some curves shown in Figs 2 and 3. Such feature is actually a manifestation of small Tc variations in adjacent sections of the film and disappear in the reconstructed R-vs-T curves for four section resistances between two adjacent contacts 24 . Of course, such a four-probe configuration significantly complicates the analysis of the resistive measurements.…”

Section: Non-local Transport Characteristics Of Nbn Films In Magnetic...mentioning

confidence: 98%

“…4a is caused by the play of parameters, and do not have any fundamental significance. Using related formulas from the paper 24 (cf. also "Methods" section), we found separate R(T) resistances of the four sections (Fig.…”

Section: Non-local Transport Characteristics Of Nbn Films In Magnetic...mentioning

confidence: 99%

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Competing length scales and 2D versus 3D dimensionality in relatively thick superconducting NbN films

Belogolovskii

Poláčková

Zhitlukhina

et al. 2023

Preprint

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Magneto-transport characteristics of 2D and 3D superconducting layers, in particular, temperature and angular dependences of the upper critical field Hc2, are usually considered to be fundamentally different. In the work, we have verified this statement by probing effective dimensions of nm-thick NbN films using non-local resistance measurements at temperatures near the normal-to-superconducting transition. It was found that in relatively thick NbN layers, the thicknesses of which varied from 50 to 100 nanometers, the temperature effect on Hc2 certainly pointed to the three-dimensionality of the samples, while the angular dependence of Hc2 revealed behavior typical for 2D samples. The seeming contradiction is explained by an intriguing interplay of three length scales in the dimensionally confined superconducting films: the thickness, the Ginzburg-Landau coherence length, and the magnetic-field penetration depth. Our results provide new insights into the physics of superconducting films with an extremely large ratio of the London penetration depth to the Ginzburg-Landau coherence length exhibiting 3D isotropic superconducting properties and the 2D transport regime simultaneously.

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Section: Non-local Transport Characteristics Of Nbn Films In Magnetic...mentioning

confidence: 68%

Section: Sample Preparationmentioning

confidence: 96%

Section: Non-local Transport Characteristics Of Nbn Films In Magnetic...mentioning

confidence: 98%

Section: Non-local Transport Characteristics Of Nbn Films In Magnetic...mentioning

confidence: 99%

See 2 more Smart Citations

Competing length scales and 2D versus 3D dimensionality in relatively thick superconducting NbN films

Belogolovskii

Poláčková

Zhitlukhina

et al. 2023

Preprint

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show abstract

“…ITO (Conductivity 1.43 × 10 5 (1/Ω cm))substrate is a common material used to make transparent electrodes, with a transparency of 81%-94%. Researchers used the four-point probe method [14] to measure the film resistance of ITO materials (figure 2), and the results showed that the selected ITO material had a low resistivity (4.65 Ω sq −1 ) and low sheet resistance could improve the radiation efficiency of the antenna.…”

Section: Antenna Designmentioning

confidence: 99%

A flexible and transparent pliers shaped antenna for ultra-wideband applications

Zhang,

Guo,

Lian

et al. 2023

Flex. Print. Electron.

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Flexible transparent antennas have broad potential applications in wireless communication and RF energy harvesting, providing visualization, small size, and integration functions for electronic devices. The use of optically transparent materials is an essential direction in the development of flexible transparent antennas. In this paper, a flexible and transparent antenna is designed by ITO material and photolithography process, which is suitable for wideband communication field. The broadband characteristics of the antenna are realized by using irregular slots and rectangular microstrip lines on the ground plane. The antenna operates in the frequency range of 1.73-20GHz with a relative bandwidth of 168%, which is suitable for ultra-wideband applications. The antenna has a compact structure and the relative size of 0.33 λ0×0.28 λ0. The measured results of the antenna are in good agreement with the simulated results, and the bending and folding tests show that the antenna has good mechanical flexibility and can cover the surface of irregular objects. This pliers-shaped antenna is applicable to a variety of ultra-wideband (UWB) and wireless applications, such as LTE, Wi Max, 5G network, IoT, WIFI, mobile phone keys, and mobile payment.

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Competing length scales and 2D versus 3D dimensionality in relatively thick superconducting NbN films

Belogolovskii,

Poláčková,

Zhitlukhina

et al. 2023

Sci Rep

View full text Add to dashboard Cite

Magneto-transport characteristics of 2D and 3D superconducting layers, in particular, temperature and angular dependences of the upper critical field Hc2, are usually considered to be fundamentally different. In the work, using non-local resistance measurements at temperatures near the normal-to-superconducting transition, we probed an effective dimensionality of nm-thick NbN films. It was found that in relatively thick NbN layers, the thicknesses of which varied from 50 to 100 nm, the temperature effect on Hc2 certainly pointed to the three-dimensionality of the samples, while the angular dependence of Hc2 revealed behavior typical for 2D samples. The seeming contradiction is explained by an intriguing interplay of three length scales in the dimensionally confined superconducting films: the thickness, the Ginzburg–Landau coherence length, and the magnetic-field penetration depth. Our results provide new insights into the physics of superconducting films with an extremely large ratio of the London penetration depth to the Ginzburg–Landau coherence length exhibiting simultaneously 3D isotropic superconducting properties and the 2D transport regime.

show abstract

Probing superconducting granularity using nonlocal four-probe measurements

Cited by 5 publications

References 21 publications

Competing length scales and 2D versus 3D dimensionality in relatively thick superconducting NbN films

Competing length scales and 2D versus 3D dimensionality in relatively thick superconducting NbN films

A flexible and transparent pliers shaped antenna for ultra-wideband applications

Competing length scales and 2D versus 3D dimensionality in relatively thick superconducting NbN films

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