Columnar defects acting as passive internal field detectors

Details Columnar defects acting as passive internal field detectors Columnar defects acting as passive internal field detectors

2001-10-30

arxiv.org/abs/cond-mat/0110633v1

Phys. Rev. B 65, 174525 (2002)

Physics

Condensed Matter

Superconductivity

5 figures

Scientific paper

10.1103/PhysRevB.65.174525

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 $H \sim 0.02 H_{c2}$, 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.

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