Frequency and Field Variation of Vortex Dynamics in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>O</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:mn><mml:mo>−</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msu

Wu, Dong Ho; Booth, James C.; Anlage, Steven M.

doi:10.1103/physrevlett.75.525

Cited by 61 publications

(47 citation statements)

References 14 publications

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“…We explicitly measure the temporal correlations of the fluctuation superconductivity and demonstrate the manner in which their time scales diverge on the approach to the transi- Experiments were performed in a broadband 'Corbino' microwave spectrometer. This technique has been used previously to study high T c superconductor films, electron glasses, and heavy fermions [17][18][19][20][21] . In this technique, a microwave signal is reflected by a sample that terminates the otherwise open-ended coaxial transmission line and is detected by a network analyzer.…”

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confidence: 99%

Dynamical study of phase fluctuations and their critical slowing down in amorphous superconducting films

et al. 2011

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We report a comprehensive study of the complex AC conductance of amorphous superconducting InOx thin films. We measure the explicit frequency dependency of the complex conductance and the phase stiffness over a range from 0.21 to 15 GHz at temperatures down to 350 mK using a novel broadband microwave Corbino spectrometer. The dynamic ac measurements are sensitive to the temporal correlations of the superconducting order parameter in the fluctuation range above Tc. Among other aspects, we explicitly demonstrate the critical slowing down of the characteristic fluctuation rate on the approach to the superconducting state and show that its behavior is consistent with vortex-like phase fluctuations and a phase-ordering scenario of the transition.

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confidence: 99%

Dynamical study of phase fluctuations and their critical slowing down in amorphous superconducting films

et al. 2011

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“…29 and thin films. 30 Inserting the diffusivity ratio hϭi / 0 with 0 ϭD VL / c 2 in Eq. ͑10͒ one realizes that the percolation model predicts the same scaling law as the vortex glass theory.…”

Section: Scaling Regimementioning

confidence: 99%

Percolative vortex motion in high-temperature superconductors

Ziese

1996

Phys. Rev. B

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A model for percolative vortex motion in inhomogeneous superconductors is introduced. Near the percolation threshold the linear, frequency-dependent electronic conductivity is found to obey scaling laws. The percolation model for vortex motion provides an alternative explanation to the experimental finding of scaling in the electronic conductivity that is conventionally attributed to a vortex glass transition. The critical exponents derived from simulations of bond percolation on three-dimensional lattices are in satisfying agreement with critical exponents obtained from the scaling analysis of the conductivity of YBa 2 Cu 3 O 7Ϫ␦ twinned single crystals and ceramics. The electronic conductivity is calculated in an effective medium approximation and is compared to experimental data.

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“…Unfortunately, so far there is no technique available that fulfills all of these options: Corbino reflection spectroscopy is applicable in extremely broad frequency ranges (up to 40 GHz) 5,6 and at cryogenic temperatures, [7][8][9][10] is phase-sensitive, and has been used in the study of conventional and exotic superconductors [11][12][13][14][15] , correlated metals, [16][17][18] , and materials close to a transition between conductive and insulating states. 19 While the Corbino approach is applicable for bulk samples of lossy conductors, 9,19,20 its comparably poor sensitivity restricts its applicability for highly conductive metals and superconductors to geometrically strongly confined samples, 6,7,9 such as thin films.…”

Section: Introductionmentioning

confidence: 99%

Surface-resistance measurements using superconducting stripline resonators

Hafner

Dressel

Scheffler

2014

Review of Scientific Instruments

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We present a method to measure the absolute surface resistance of conductive samples at a set of GHz frequencies with superconducting lead stripline resonators at temperatures 1 -6 K. The stripline structure can easily be applied for bulk samples and allows direct calculation of the surface resistance without the requirement of additional calibration measurements or sample reference points. We further describe a correction method to reduce experimental background on high-Q resonance modes by exploiting TEM-properties of the external cabling. We then show applications of this method to the reference materials gold, tantalum, and tin, which include the anomalous skin effect and conventional superconductivity. Furthermore, we extract the complex optical conductivity for an all-lead stripline resonator to find a coherence peak and the superconducting gap of lead.

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Frequency and Field Variation of Vortex Dynamics inYBa2Cu3O7−δ

Cited by 61 publications

References 14 publications

Dynamical study of phase fluctuations and their critical slowing down in amorphous superconducting films

Dynamical study of phase fluctuations and their critical slowing down in amorphous superconducting films

Percolative vortex motion in high-temperature superconductors

Surface-resistance measurements using superconducting stripline resonators

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