Abstract
The Hall effect in the mixed state of thin films of the high-temperature superconductor YBa2Cu3O7−δ (YBCO) that were patterned with a square array of regions with suppressed superconducting order parameter is investigated. Cylindrical defect columns penetrating the entire thin YBCO film along its crystallographic c−axis have been created by irradiation with He+ ions through a silicon stencil mask. Distinct peaks of the critical current at commensurate arrangements of magnetic flux quanta with the artificial defect lattice confirm enhanced vortex pinning. Vortex motion not only leads to a dissipative voltage along the current direction but also to a transverse voltage, termed vortex Hall effect. We report on the observation of a novel commensurability effect in the transverse Hall signal. A sign change and a positive peak of the Hall coefficient appear in a narrow magnetic field range around the matching field. The feature appears in the temperature range below the critical temperature, where the Hall effect usually is negative in underdoped and optimally-doped cuprate superconductors. The results indicate that the Hall matching effect originates from enhanced pinning of the vortices along the regular defect columns.
Original language | English |
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Pages (from-to) | 144-147 |
Number of pages | 4 |
Journal | Physica C: Superconductivity and its Applications |
Volume | 533 |
DOIs | |
Publication status | Published - 15 Feb 2017 |
Austrian Fields of Science 2012
- 103020 Surface physics
- 103033 Superconductivity
- 103018 Materials physics
- 103009 Solid state physics
Keywords
- DYNAMICS
- FLOW
- FLUCTUATIONS
- HIGH-TEMPERATURE SUPERCONDUCTORS
- II SUPERCONDUCTORS
- MAGNETIC-FIELDS
- Pinning
- REGULAR ARRAYS
- RESISTIVITY
- REVERSAL
- SUPERFLUIDS
- Superconductors
- Vortex Hall effect
- Vortex matching