Vortex Fluctuations in High-Tc Films: Flux Noise Spectrum and Complex Impedance
1999 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 83, no 26, 5567-5570 p.Article in journal (Refereed) Published
The flux noise spectrum and complex impedance for a 500 Å thick YBCO film are measured and comparedwith predictions for two-dimensional vortex fluctuations. It is verified that the complex impedanceand the flux noise spectra are proportional to each other, that the logarithm of the flux noise spectrafor different temperatures has a common tangent with slope 21, and that the amplitude of the noisedecreases as d23, where d is the height above the film at which the magnetic flux is measured. Acrossover from normal to anomalous vortex diffusion is indicated by the measurements and is discussedin terms of a two-dimensional decoupling.
Place, publisher, year, edition, pages
1999. Vol. 83, no 26, 5567-5570 p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:uu:diva-91198DOI: 10.1103/PhysRevLett.83.5567OAI: oai:DiVA.org:uu-91198DiVA: diva2:163851