The in-plane anisotropy of the resistivity ρab(θ) has been measured on a twinned 60 K YBa2Cu3O7-δ (YBCO) single crystal under magnetic fields H precisely parallel to the CuO2 planes. ρab(θ) curves are described by the superposition of the twofold and fourfold symmetry, and the dip structure appears at θ = 0° and 90°. The fourfold anisotropy is first observed in YBCO system in the resistivity measurements. We show that the obtained results are explained by the superconducting fluctuation, the symmetry of the superconducting energy gap of the d-wave pairing and the effect of the vortex pinning.
- 60 K YBCO single crystal
- In-plane anisotropy
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering