Anisotropy of the Vortex Structure and Resistivity in the Basal Plane of YBa2Cu4O8 Single Crystals

摘要

The vortex lattice of the YBa2Cu4O8 high-temperature superconductor is studied in the basal plane of monocrystalline samples using the decoration technique in a field interval of 40-600 Oe. Vortex lattice anisotropy (field-independent "compression" of a regular hexagonal vortex cell in the poorly conducting direction by a factor of about 1.3) is detected. Resistivity anisotropy rho(a)/rho(b) measured at temperatures from T-c to room temperature is 16-9. Possible reasons for the discrepancy between our results and the available data are discussed.