Columnar defects acting as passive internal field detectors

Abstract

We have studied the angular dependence of the irreversible magnetization of several YBa${}_2$Cu${}_3$O${}_7$ and 2H-NbSe${}_2$ single crystals with columnar defects tilted off the c-axis. At high magnetic fields, the irreversible magnetization $M_i({\Theta }_H)$ exhibits a well known maximum when the applied field is parallel to the tracks. As the field is decreased below $H\sim 0.02H_{c2}$, 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.

5 figures

References in corpus (1)

• Irreversible magnetization under rotating fields and lock-in effect on ErBa_2Cu_3O_7 single crystal with columnar defects

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