Thermally assisted flux creep of a driven vortex lattice in untwinned YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} single crystals
The authors have studied the driven vortex lattice in untwinned, clean YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} single crystals, showing the first order (melting) transition T{sub m}. At high enough driving currents (j {approximately} 10{sup 3} A/cm{sup 2}, j {approx{underscore}gt} j{sub c}) and temperatures T < T{sub m}, a clear distinction is found between two different behaviors 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{sub 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.
- Research Organization:
- Royal Inst. of Tech., Stockholm (SE)
- OSTI ID:
- 20015315
- Journal Information:
- Journal of Low Temperature Physics, Vol. 117, Issue 5-6; Conference: International Conference on Physics and Chemistry of Molecular and Oxide Superconductors, Stockholm (SE), 07/28/1999--08/02/1999; Other Information: PBD: Dec 1999; ISSN 0022-2291
- Country of Publication:
- United States
- Language:
- English
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