Magnetic fields above the surface of a superconductor with internal magnetism

Details Magnetic fields above the surface of a superconductor with internal magnetism Magnetic fields above the surface of a superconductor with internal magnetism

2007-05-28

arxiv.org/abs/0705.4118v2

Phys. Rev. B 76, 144507 (2007)

Physics

Condensed Matter

Superconductivity

8 pages, 2 figures. Journal version. Added one figure, some discussion. A few typos corrected

Scientific paper

10.1103/PhysRevB.76.144507

The author presents a method for calculating the magnetic fields near a planar surface of a superconductor with a given intrinsic magnetization in the London limit. He computes solutions for various magnetic domain boundary configurations and derives relations between the spectral densities of the magnetization and the resulting field in the vacuum half space, which are useful if the magnetization can be considered as a statistical quantity and its features are too small to be resolved individually. The results are useful for analyzing and designing magnetic scanning experiments. Application to existing data from such experiments on Sr$_2$RuO$_4$ show that a domain wall would have been detectable, but the magnetic field of randomly oriented small domains and small defects may have been smaller than the experimental noise level.

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