RF RESPONSE OF ALONG-PLANE VORTICES IN BI2SR2CACU2OY

RF magnetic field applied parallel to the superconducting plane of a s ingle crystal Bi2Sr2CaCu2Oy generates a longitudinal ultrasonic wave t hrough the pinning interaction under a static magnetic field. Interpla y of the intrinsic and in-plane pinnings of vortices results in a dist inct peak in the generation intensity when the static field is almost parallel to the plane. The sharp dip at the center of the peak observe d at low temperature is ascribed to the locking of the Josephson vorti ces due to the intrinsic pinning.