AC conductivity of a niobium thin film in a swept magnetic field

Tsindlekht, M. I.; Genkin, V. M.; Gaži, Š.; Chromík, Š.

doi:10.1088/0953-8984/25/8/085701

Cited by 4 publications

(16 citation statements)

References 17 publications

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“…The ac response of sample A in the SF mode is similar to that reported in our previous papers [5,17]. In this sample we observe a smooth field dependence of χ ′′ 1 , χ 2 and χ 3 .…”

Section: B Ac Responsesupporting

confidence: 89%

“…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%

“…In this sample we observe a smooth field dependence of χ ′′ 1 , χ 2 and χ 3 . The models proposed in [5,17] can explain the experimental data for sample A in magnetic fields lower and higher than H c2 . The case with the sample B is more complicated.…”

Section: B Ac Responsementioning

confidence: 86%

“…For example vortex velocity in the perpendicular geometry is a few orders magnitude larger than for the parallel one, see Ref. [17].…”

Section: A DC Magnetization Curvesmentioning

confidence: 99%

“…The effect of a swept dc field can more suitably be investigated by using hollow thin-walled superconducting cylinders, rather than by bulk samples, because one can control the field transmission through their walls. 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: 98%

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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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“…The ac response of sample A in the SF mode is similar to that reported in our previous papers [5,17]. In this sample we observe a smooth field dependence of χ ′′ 1 , χ 2 and χ 3 .…”

Section: B Ac Responsesupporting

confidence: 89%

“…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: B Ac Responsementioning

confidence: 86%

“…For example vortex velocity in the perpendicular geometry is a few orders magnitude larger than for the parallel one, see Ref. [17].…”

Section: A DC Magnetization Curvesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 3 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

Self Cite

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Magnetic moment jumps in flat and nanopatterned Nb thin-walled cylinders

Tsindlekht

Genkin

Felner

et al. 2017

Physica C: Superconductivity and its Applications

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Projection-reduction method applied to deriving non-linear optical conductivity for an electron-impurity system

2013

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The projection-reduction method introduced by the present authors is known to give a validated theory for optical transitions in the systems of electrons interacting with phonons. In this work, using this method, we derive the linear and first order nonlinear optical conductivites for an electron-impurity system and examine whether the expressions faithfully satisfy the quantum mechanical philosophy, in the same way as for the electron-phonon systems. The result shows that the Fermi distribution function for electrons, energy denominators, and electron-impurity coupling factors are contained properly in organized manners along with absorption of photons for each electron transition process in the final expressions. Furthermore, the result is shown to be represented properly by schematic diagrams, as in the formulation of electron-phonon interaction. Therefore, in conclusion, we claim that this method can be applied in modeling optical transitions of electrons interacting with both impurities and phonons

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AC conductivity of a niobium thin film in a swept magnetic field

Cited by 4 publications

References 17 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

Magnetic moment jumps in flat and nanopatterned Nb thin-walled cylinders

Projection-reduction method applied to deriving non-linear optical conductivity for an electron-impurity system

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