dc and ac magnetic properties of thin-walled superconducting niobium cylinders

Tsindlekht, M. I.; Genkin, V. M.; Felner, I.; Zeides, F.; Katz, Nadav; Gaži, Š.; Chromík, Š.

doi:10.1103/physrevb.90.014514

Cited by 12 publications

(18 citation statements)

References 48 publications

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“…This was confirmed in experiments with bulk and thin-walled cylinders samples [15,16] and [5,17], respectively. Fig.…”

Section: B Ac Responsesupporting

confidence: 63%

“…However, experimental results obtained recently for thinwalled macroscopic cylinders do not agree with this expectation. Namely, in such Nb cylinders we succeeded in monitoring the magnetic moment of the current circulating in the walls and observed dc magnetic moment jumps even in fields much lower than H c1 of the film itself [5]. So far it is not clear what mechanism is responsible for such flux jumps.…”

Section: Introductionmentioning

confidence: 99%

“…* for A sample and samples from [5] shows that the thermodynamics cannot describe these magnetization jumps in samples without antidots. It was demonstrated that at low temperature and at magnetic fields higher than some critical value, H th , the magnetization curve becomes smooth and H th is sufficiently larger in the sample with an array of antidots [4].…”

Section: A DC Magnetization Curvesmentioning

confidence: 99%

“…Previously, we have shown [17] that in a thin-walled cylinder in the mixed state, the effect of sweeping a dc field on the ac response is due to an enhancement of the vortex motion through the wall. Above H c2 , however, this picture is no longer appropriate and the experimental data were explained within the framework of a simple relaxation model [5].…”

Section: Introductionmentioning

confidence: 99%

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dc and ac magnetic properties of thin-walled Nb cylinders with and without a row of antidots

Tsindlekht¹,

Genkin²,

Felner³

et al. 2016

J. Phys.: Condens. Matter

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dc and ac magnetic properties of two thin-walled superconducting Nb cylinders with a rectangular cross-section are reported. Magnetization curves and the ac response were studied on as-prepared and patterned samples in magnetic fields parallel to the cylinder axis. A row of micron-sized antidots (holes) was made in the film along the cylinder axis. Avalanche-like jumps of the magnetization are observed for both samples at low temperatures for magnetic fields not only above Hc1, but in fields lower than Hc1 in the vortex-free region. The positions of the jumps are not reproducible and they change from one experiment to another, resembling vortex lattice instabilities usually observed for magnetic fields larger than Hc1. At temperatures above 0.66Tc and 0.78Tc the magnetization curves become smooth for the patterned and the as-prepared samples, respectively. The magnetization curve of a reference planar Nb film in the parallel field geometry does not exhibit jumps in the entire range of accessible temperatures. The ac response was measured in constant and swept dc magnetic field modes. Experiment shows that ac losses at low magnetic fields in a swept field mode are smaller for the patterned sample. For both samples the shapes of the field dependences of losses and the amplitude of the third harmonic are the same in constant and swept field near Hc3. This similarity does not exist at low fields in a swept mode.

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“…This was confirmed in experiments with bulk and thin-walled cylinders samples [15,16] and [5,17], respectively. Fig.…”

Section: B Ac Responsesupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Section: A DC Magnetization Curvesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

dc and ac magnetic properties of thin-walled Nb cylinders with and without a row of antidots

Tsindlekht¹,

Genkin²,

Felner³

et al. 2016

J. Phys.: Condens. Matter

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“…in the surface superconducting (SSC) state, deserves also a special attention [11]. SSC can be also the place of very peculiar and interesting properties as reported in [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Change of surface critical current in the surface superconductivity and mixed states of superconducting niobium

Aburas

Pautrat

Bellido

2016

Supercond. Sci. Technol.

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A systematic study of irreversible magnetization was performed in bulk Niobium after different surface treatments. Starting with smooth surfaces and abrading them, a strong increase of the critical current is observed up an apparent limiting value. An impressive change of the critical current is also observed in the surface superconductivity (SSC) state, reaching values of the same order of magnitude as in the mixed state. We explain also the observation of strong SSC for magnetic field perpendicular to larges facets in terms of nucleation of SC along bumps of a corrugated surface.

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Use of XPS to clarify the Hall coefficient sign variation in thin niobium layers buried in silicon

Demchenko

Lisowski

Syryanyy

et al. 2017

Applied Surface Science

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dc and ac magnetic properties of thin-walled superconducting niobium cylinders

Cited by 12 publications

References 48 publications

dc and ac magnetic properties of thin-walled Nb cylinders with and without a row of antidots

dc and ac magnetic properties of thin-walled Nb cylinders with and without a row of antidots

Change of surface critical current in the surface superconductivity and mixed states of superconducting niobium

Use of XPS to clarify the Hall coefficient sign variation in thin niobium layers buried in silicon

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