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Three-dimensional XY critical fluctuations of the dc electrical conductivity in Bi2Sr2CaCu2O8+delta single crystals
KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
2000 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 61, no 17, 11776-11779 p.Article in journal (Refereed) Published
Abstract [en]

A method is presented to analyze the dc critical fluctuation conductivity Delta sigma of Bi2Sr2CaCu2O8+delta single crystals in zero magnetic field. Two crossovers are obtained upon approaching T-c; first the Ginzburg crossover from the mean-held region to the initial critical regime, where the critical exponent a of Delta sigma changes from -1/2 to -2/3, and then, closer to T-c, a crossover of alpha form -2/3 to 1/3 in the critical region. Good agreement is found with the expectations from the three-dimensional XY model.

Place, publisher, year, edition, pages
2000. Vol. 61, no 17, 11776-11779 p.
Keyword [en]
high-tc superconductors, ii superconductors, phase-transitions, magnetic-field, yba2cu3o7-delta, magnetoconductivity, paraconductivity, diamagnetism, growth
URN: urn:nbn:se:kth:diva-19736ISI: 000086937700094OAI: diva2:338428
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Rapp, Östen.
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