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Columnar defects acting as passive internal field detectors

By A. V. Silhanek, L. Civale, M. A. Avila, Comisión Nacional, Energía Atómica-centro and Atómico Bariloche


We have studied the angular dependence of the irreversible magnetization of several YBa2Cu3O7 and 2H-NbSe2 single crystals with columnar defects tilted off the c-axis. At high magnetic fields, the irreversible magnetization Mi(ΘH) exhibits a well known maximum when the applied field is parallel to the tracks. As the field is decreased below H ∼ 0.02Hc2, the peak shifts away from the tracks ’ direction toward either the c-axis or the ab-planes. We demonstrate that this shift results from the misalignment between the external and internal field directions due to the competition between anisotropy and geometry effects. I

Year: 2008
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