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In-plane anisotropy and possible chain contribution to magnetoconductivity in YBa2Cu3O7-delta
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2001 (English)In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 6322, no 22Article in journal (Refereed) Published
Abstract [en]

The magnetoresistivity of untwinned YBa2Cu3O7-delta Single crystals was measured in magnetic fields up to 12 T-c for B parallel toc and B parallel to ab. at temperatures up to T-c + 84 K and T-c + 50 K, respectively. Two issues were addressed; determination of the in-plane coherence length anisotropy gamma=xi (b)/xi (a) and discussion of the role of the CuO chains in the magnetoconductivity Delta sigma. A fluctuation conductivity theory that allows for an in-plane coherence length anisotropy (xi (a)not equal xi (b)) as well as an extension of the usual Aronov-Hikami-Larkin theory that does not, were used in analyses. The results suggest that the anisotropy gamma is close to 1. The analyses also suggest a contribution to the magnetoconductivity from the CuO chains of a sign which depends on the direction between held and current.

Place, publisher, year, edition, pages
2001. Vol. 6322, no 22
Keyword [en]
high-temperature superconductors, a-b plane, single-crystals, magnetic-field, untwinned yba2cu3o7-delta, fluctuation conductivity, penetration depth, resistivity, magnetoresistance, paraconductivity
URN: urn:nbn:se:kth:diva-20711ISI: 000169283000088OAI: diva2:339407
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Rapp, Östen.
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Microelectronics and Information Technology, IMIT
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