Thermally assisted flux creep of a driven vortex lattice in untwinned YBa2Cu3O7-delta single crystals
1999 (English)In: Journal of Low Temperature Physics, ISSN 0022-2291, E-ISSN 1573-7357, Vol. 117, no 5-6, 1335-1339 p.Article in journal (Refereed) Published
We have studied the driven vortex lattice in untwinned, clean YBa2 Cu-3 O7-delta single crystals, showing the first order (melting) transition T-m. At high enough driving currents (j similar to 10(3) A/cm(2), j greater than or similar to j(c)) and temperatures T < T-m a clear distinction is found between two different behaviours of the moving vortex lattice. The onset of dissipation is characterized by a noisy flux creep with a temperature independent activation energy U(j). At higher temperatures, the creep regime crosses over into a flux flow regime with linear resistivity. Apart from the dip in resistivity at T-m, associated with the peak effect and usually assigned to a softening of the shear modulus, the resistivity of the flowing flux lattice continuously extends into the vortex-liquid.
Place, publisher, year, edition, pages
NEW YORK: Kluwer Academic Publishers, 1999. Vol. 117, no 5-6, 1335-1339 p.
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:kth:diva-49988DOI: 10.1023/A:1022517011159ISI: 000084486600056OAI: oai:DiVA.org:kth-49988DiVA: diva2:460891
QC 20111206. International Conference on Physics and Chemistry of Molecular and Oxide Superconductors (MOS-99), ROYAL INST TECHNOL, STOCKHOLM, SWEDEN, JUL 28-AUG 02, 19992011-12-012011-12-012011-12-06Bibliographically approved