Abstract
The vortex lattice in untwinned and twinned YBCO single crystals has been observed in function of the magnetic field orientation, using the high-resolution Bitter decoration technique [6]. In untwinned samples and in tilted fields, a chain structure appears, which is independent of crystallographic orientation. In weekly twinned samples, pinning along the twin boundaries is still present in addition to the vortex-chain state. A quantitative analysis of these observations and comparison to theory is presented.
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