INFLUENCE OF THE REAL SHAPE OF A SAMPLE ON THE PINNING INDUCED MAGNETOSTRICTION

The pinning induced magnetostriction in an isotropic superconductor wa s calculated for different sample shapes. We analyzed some special sha pes for which the solution can be found analytically. The magnetostric tion of a finite slab was considered. In order to determine the influe nce of demagnetization effects, the pinning induced magnetostriction o f an infinitely long and thin strip was calculated. A simple, approxim ate formula can be used in particular cases to analyze the magnetostri ction induced by pinning forces. In this formula the magnetostriction of a sample is connected directly with its magnetization. We also pres ent some experimental results on high temperature superconductors whic h are analyzed in frames of the developed theory. (C) 1998 American In stitute of Physics. [S0021-8979(98)04319-9]