Abstract
Through the measurement of the mutual conversion between ultrasonic waves (UW) and electromagnetic waves via pinning of the vortex to the lattice, the pinning of the vortex in Bi 2 Sr 2 CaCu 2 O 8+δ has been investigated. The interaction with the longitudinal UW is dramatically enhanced due to the intrinsic pinning of the Josephson-like vortex, when the magnetic field is applied nearly parallel to the superconducting plane, forming a sharp twin-peak-like structure. Based on the angle dependence, we argue that there is a crossover from intrinsic pinning to pancake pinning. The temperature and magnetic field intensity dependence of the intrinsic pinning is discussed as well as the sample dependence with regard to the level of oxygen-doping. The transverse UW with polarization parallel to the superconducting plane is found not to interact with the vortex via intrinsic pinning, although it can couple via the pancake vortex.
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