Evidence for vortex staircases in the whole angular range due to competing correlated pinning mechanisms

Details Evidence for vortex staircases in the whole angular range due to competing correlated pinning mechanisms Evidence for vortex staircases in the whole angular range due to competing correlated pinning mechanisms

1999-02-22

arxiv.org/abs/cond-mat/9902302v1

Phys.Rev.B 59, 13620 (1999)

Physics

Condensed Matter

Superconductivity

9 figures, 4 figures

Scientific paper

10.1103/PhysRevB.59.13620

We analyze the angular dependence of the irreversible magnetization of YBa$_2$Cu$_3$O$_7$ crystals with columnar defects inclined from the c-axis. At high fields a sharp maximum centered at the tracks' direction is observed. At low fields we identify a lock-in phase characterized by an angle-independent pinning strength and observe an angular shift of the peak towards the c-axis that originates in the material anisotropy. The interplay among columnar defects, twins and ab-planes generates a variety of staircase structures. We show that correlated pinning dominates for all field orientations.

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