Radio-Frequency Resistance in the Mixed State for Subcritical Currents

Gittleman, J. I.; Rosenblum, Bruce

doi:10.1103/physrevlett.16.734

Cited by 415 publications

(355 citation statements)

References 7 publications

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“…When creep can be neglected ( = 0), the above expression reverts to the well-known Gittleman-Rosemblum model [20].…”

Section: Experimental Technique and Data Analysismentioning

confidence: 99%

“…The mixed state microwave response, which includes vortex dynamics, is quite intricate, since it emerges from the interplay between the currents excited by the applied microwave fields and vortices set in motion by these currents. Many authors considered this issue, providing models which take into accounts various aspects [20][21][22][23][24]. Following Coffey-Clem (CC) approach [21], the whole complex resistivityρ can be written down as follows:…”

Section: Experimental Technique and Data Analysismentioning

confidence: 99%

See 1 more Smart Citation

Microwave properties of DyBCO monodomain in the mixed state and comparison with other RE-BCO systems

Pompeo

Rogai

Ausloos

et al. 2011

Physica C: Superconductivity and its Applications

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“…When creep can be neglected ( = 0), the above expression reverts to the well-known Gittleman-Rosemblum model [20].…”

Section: Experimental Technique and Data Analysismentioning

confidence: 99%

Section: Experimental Technique and Data Analysismentioning

confidence: 99%

Microwave properties of DyBCO monodomain in the mixed state and comparison with other RE-BCO systems

Pompeo

Rogai

Ausloos

et al. 2011

Physica C: Superconductivity and its Applications

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show abstract

“…In the Meissner state the ac response has been usually described with the two fluid model. 41,42 In the mixed state, the magnetic flux enters in the form of quantized vortices. Therefore the dynamics of the vortices has to be included in a description of the magnetic ac response of the mixed state.…”

Section: A Two Fluid Model and Coffey And Clem Modelmentioning

confidence: 99%

ac magnetic response of mesoscopic type-II superconductors

Hernandez

Domı́nguez

2002

Phys. Rev. B

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The response of mesoscopic superconductors to an ac magnetic field is numerically investigated on the basis of the time-dependent Ginzburg-Landau equations (TDGL). We study the dependence with frequency ω and dc magnetic field H dc of the linear ac susceptibility χ(H dc , ω) in square samples with dimensions of the order of the London penetration depth. At H dc = 0 the behavior of χ as a function of ω agrees very well with the two fluid model, and the imaginary part of the ac susceptibility, χ"(ω), shows a dissipative a maximum at the frequency νo = c 2 /(4πσλ 2 ). In the presence of a magnetic field a second dissipation maximum appears at a frequency ωp ≪ ν0. The most interesting behavior of mesoscopic superconductors can be observed in the χ(H dc ) curves obtained at a fixed frequency. At a fixed number of vortices, χ"(H dc ) continuously increases with increasing H dc . We observe that the dissipation reaches a maximum for magnetic fields right below the vortex penetration fields. Then, after each vortex penetration event, there is a sudden suppression of the ac losses, showing discontinuities in χ"(H dc ) at several values of H dc . We show that these discontinuities are typical of the mesoscopic scale and disappear in macroscopic samples, which have a continuos behavior of χ(H dc ). We argue that these discontinuities in χ(H dc ) are due to the effect of nascent vortices which cause a large variation of the amplitude of the order parameter near the surface before the entrance of vortices.

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“…As a consequence, the overall effect has to be averaged over the sample surface. On very general grounds, the resistivity incorporates a factor proportional to the electric field originating from the Lorentz force J × B [16,17]. This factor can acquire a very complicated angular dependence in anisotropic superconductors [18,19], but the essential point is that this additional factor is just an additional Fig.1, plotted versus a rescaled field with an empirically scaling function εemp(θ), determined in order to achieve best scaling.…”

Section: Failure Of the Angular Scalingmentioning

confidence: 99%

“…The larger the pinning, the larger r. One may make a step further, introducing e.g. the established vortex motion model by Gittleman and Rosenblum [17] (to which, by the way, many different models correspond when vortex creep can be neglected [21]), where the complex resistivity can be written:…”

Section: Evidence For Directional Pinningmentioning

confidence: 99%

Directional Vortex Pinning at Microwave Frequency in YBa2Cu3O7−x Thin Films with BaZrO3 Nanorods

Pompeo

Torokhtii

Augieri

et al. 2012

J Supercond Nov Magn

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We investigate the effect of the anisotropy and of the directional pinning in YBa 2 Cu 3 O 7−x films grown by pulsed laser ablation from targets containing BaZrO 3 at 5% mol. BaZrO 3 inclusions self-assemble to give nanorods oriented along the c-axis, thus giving a preferential direction for vortex pinning. The directionality of vortex response is studied at high ac frequency with the complex microwave response at 48 GHz, as a function of the applied field and of the angle θ between the field and the c-axis. The complex microwave response does not exhibit any angular scaling, suggesting that the structural anisotropy of YBa 2 Cu 3 O 7−x is supplemented by at least another preferred orientation. The pinning parameter r shows evidence of directional pinning, effective in a wide range of angles around the c-axis (thus ascribed to BZO nanocolumns).

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Radio-Frequency Resistance in the Mixed State for Subcritical Currents

Cited by 415 publications

References 7 publications

Microwave properties of DyBCO monodomain in the mixed state and comparison with other RE-BCO systems

Microwave properties of DyBCO monodomain in the mixed state and comparison with other RE-BCO systems

ac magnetic response of mesoscopic type-II superconductors

Directional Vortex Pinning at Microwave Frequency in YBa2Cu3O7−x Thin Films with BaZrO3 Nanorods

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