Abstract
μSR experiments on a large single crystal sample of YBa 2Cu 3O 7− δ with non-conducting Y 2BaCuO 5 inclusions show some interesting characteristics, especially the magnetic field distribution in the inclusion regions. This internal magnetic field distribution has been calculated using the London equations for the superconducting regions. In the model we develop here we assume that the inclusions are cylindrical and infinite in length. The interaction energy between an inclusion and an hexagonal array of vortices is also obtained. The difference between the field value in the inclusions and the value at the saddle point is sensitive, in our model, to the penetration depth. Comparing the calculated to observed field differences provides a new alternative method of determining the penetration depth.
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