μSR measurements of off-axis internal magnetic fields in anisotropic superconductors

A systematic procedure which enables the study of complicated internal field distributions is discussed. It is proposed that this may be useful for studying the fields due to the flux line lattice (FLL) of the high temperature superconductors. Moment distributions of the Fourier transform of the internal field components can be obtained. We have used the London theory as developed by Kogan and others to calculate the internal field distributions, explicitly including those field components which are transverse to the average internal field. We have used this to make estimates of the expected frequency dependence of these moment distributions.