Abstract
Anisotropic vortex dynamics of YBa2Cu3O7 single crystals with heavy-ion induced parallel and canted columnar defects are investigated and compared with that of the as-grown single crystals. Novel vortex dynamics are observed when magnetic field is applied close to the ab-plane\((\vec H \bot \hat c)\). The amplitude of the third harmonic transmittivity exhibits a secondary peak at lower temperatures in addition to a sharper peak at higher temperatures. The possible relevance of this observation to the theoretical model of “smectic crystal” to vortex-liquid phase transitions is discussed.
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