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High velocity vortex channeling in vicinal YBCO thin films
1University of Vienna, Faculty of Physics, Boltzmanngasse 5, A-1090 Wien, Austria.
Physica. C, Superconductivity
|March 14, 2013
Summary
We observed vortex channeling in Yttrium Barium Copper Oxide (YBCO) thin films at high current densities. This phenomenon, where vortices slide along cuprate layers, is enhanced by electric fields, leading to faster flux flow.
Area of Science:
- Superconductivity
- Condensed Matter Physics
- Materials Science
Background:
- Optimally doped Yttrium Barium Copper Oxide (YBa2Cu3O7-δ) thin films are crucial for high-temperature superconductivity applications.
- Understanding vortex dynamics in these materials is essential for managing critical current densities and preventing resistive losses.
Purpose of the Study:
- To investigate electrical transport properties of YBa2Cu3O7-δ thin films under high current densities and magnetic fields.
- To explore the phenomenon of vortex channeling and its dependence on electric field strength.
Main Methods:
- Pulsed-current technique in a four-probe arrangement for electrical transport measurements.
- Measurements conducted on YBa2Cu3O7-δ thin films grown on vicinal SrTiO3 substrates.
- Applied high current densities (up to 24 MA cm⁻²) and electric fields (up to 20 V/cm) at temperatures between 30 and 80 K.
Main Results:
- Observed evidence of vortex channeling (sliding motion along ab planes) when the magnetic field is parallel to the cuprate layers.
- Vortex channeling signature intensified with increasing electric field, attributed to depinning features in kinked vortex ranges.
- Current-voltage characteristics exhibited steeper slopes below ~1 V/cm due to vortex channeling, with high velocities (up to 8.6 km/s) observed above this threshold.
Conclusions:
- Vortex channeling significantly influences electrical transport in YBa2Cu3O7-δ thin films at high current densities.
- The interplay between electric fields, depinning, and vortex motion dictates the superconducting state's behavior.
- Macroscopic effects like self-heating and hot-electron phenomena require consideration in interpreting high-field transport data.
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