Unzipping Vortices in Type-II Superconductors

Details Unzipping Vortices in Type-II Superconductors Unzipping Vortices in Type-II Superconductors

2007-06-18

arxiv.org/abs/0706.2684v1

Phys. Rev. B 76, 144501 (2007)

Physics

Condensed Matter

Statistical Mechanics

19 pages 15 figures

Scientific paper

10.1103/PhysRevB.76.144501

The unzipping of vortex lines using magnetic-force microscopy from extended defects is studied theoretically. We study both the unzipping isolated vortex from common defects, such as columnar pins and twin-planes, and the unzipping of a vortex from a plane in the presence of other vortices. We show, using analytic and numerical methods, that the universal properties of the unzipping transition of a single vortex depend only on the dimensionality of the defect in the presence and absence of disorder. For the unzipping of a vortex from a plane populated with many vortices is shown to be very sensitive to the properties of the vortices in the two-dimensional plane. In particular such unzipping experiments can be used to measure the ``Luttinger liquid parameter'' of the vortices in the plane. In addition we suggest a method for measuring the line tension of the vortex directly using the experiments.

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