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Fluctuation-enhanced conductivity of high quality YBa2Cu3O7−δ single crystals

✍ Scribed by G. Kumm; K. Winzer

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
321 KB
Volume
165-166
Category
Article
ISSN
0921-4526

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✦ Synopsis

We present measurements of the in -plane resistivity Pab of YBa 2 Cu 3 0 7 _ 8 single crystals with T c '" 92 K and (lab ( 100 K) '" 50 (lOcm. The temperature dependence of the fluctuation conductivity above T c is analyzed in terms of direct and indirect fluctuation contributions for layered superconductors. Evidence for clean limit type -II superconductivity in our crystals is given by large values of the mean free path j! ab» ~ab'

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✍ V.N. Vieira; F.T. Dias; P. Pureur; J. Schaf 📂 Article 📅 2009 🏛 Elsevier Science 🌐 English ⚖ 213 KB

In order to test the stability of the observed fluctuation regimes, low magnetic fields were applied perpendicular to the Cu-O 2 atomic planes. When the transition is approached from above we first observe a three-dimensional (3D) Gaussian regime then a crossover to a genuine critical region where t