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**Harvard**

Svedlindh, P., Festin, O., Gunnarsson, K., Ronnung, F. och Winkler, D. (2005) *Vortex fluctuations in weak magnetic fields*.

** BibTeX **

@article{

Svedlindh2005,

author={Svedlindh, P. and Festin, O. and Gunnarsson, K. and Ronnung, F. and Winkler, Dag},

title={Vortex fluctuations in weak magnetic fields},

journal={Fluctuation and Noise Letters},

issn={0219-4775},

volume={5},

issue={1},

pages={R1-R12},

abstract={Flux-noise and ac susceptibility measurements have been performed on epitaxial films of YBa2Cu3O7. The validity of the fluctuation-dissipation-theorem is verified by the proportionality between flux noise and ac susceptibility results. The nominal zero-field flux-noise spectrum (S-phi (f)) can be characterized as follows: Below a temperature dependent frequency f(0)(T), the flux-noise spectrum is frequency independent. For frequencies f > f(0)(T), the flux-noise spectrum follows f(-x), with x approximate to 1.7 - 1.8. f(0) decreases by 4 orders of magnitude in a temperature interval of Delta T approximate to 0.5 K. Moreover, the flux-noise spectrum scales as fS(phi) = g(f/f(0)(T)), where g((.)) is a scaling function. The influence of weak perturbing magnetic fields was investigated. While the general characteristics of the flux-noise spectrum remain, the characteristic frequency f(0) increases by 3 - 4 orders of magnitude increasing the field from zero to 1 Oe. Flux-noise measurements performed using a compensating field to reduce the residual field in the experimental setup reveal new features of the measured noise spectra. The flux-noise is dominated by thermally generated vortex-antivortex pair fluctuations at temperatures below the mean-field transition temperature, while with decreasing temperature there is a transition to vortex fluctuations being dominated by field generated vortices.},

year={2005},

keywords={superconductor, flux noise, vortices, phase transition, josephson-junction arrays, flux-noise, superconducting films, complex, impedance, thin-films, dynamics, transition, vortices, motion, layers },

}

** RefWorks **

RT Journal Article

SR Print

ID 115047

A1 Svedlindh, P.

A1 Festin, O.

A1 Gunnarsson, K.

A1 Ronnung, F.

A1 Winkler, Dag

T1 Vortex fluctuations in weak magnetic fields

YR 2005

JF Fluctuation and Noise Letters

SN 0219-4775

VO 5

IS 1

SP 1

OP 12

AB Flux-noise and ac susceptibility measurements have been performed on epitaxial films of YBa2Cu3O7. The validity of the fluctuation-dissipation-theorem is verified by the proportionality between flux noise and ac susceptibility results. The nominal zero-field flux-noise spectrum (S-phi (f)) can be characterized as follows: Below a temperature dependent frequency f(0)(T), the flux-noise spectrum is frequency independent. For frequencies f > f(0)(T), the flux-noise spectrum follows f(-x), with x approximate to 1.7 - 1.8. f(0) decreases by 4 orders of magnitude in a temperature interval of Delta T approximate to 0.5 K. Moreover, the flux-noise spectrum scales as fS(phi) = g(f/f(0)(T)), where g((.)) is a scaling function. The influence of weak perturbing magnetic fields was investigated. While the general characteristics of the flux-noise spectrum remain, the characteristic frequency f(0) increases by 3 - 4 orders of magnitude increasing the field from zero to 1 Oe. Flux-noise measurements performed using a compensating field to reduce the residual field in the experimental setup reveal new features of the measured noise spectra. The flux-noise is dominated by thermally generated vortex-antivortex pair fluctuations at temperatures below the mean-field transition temperature, while with decreasing temperature there is a transition to vortex fluctuations being dominated by field generated vortices.

LA eng

OL 30