A Bayesian approach to magnetic moment determination using muSR

Details A Bayesian approach to magnetic moment determination using muSR A Bayesian approach to magnetic moment determination using muSR

2011-11-08

arxiv.org/abs/1111.1980v1

Physics

Condensed Matter

Other Condensed Matter

To be published in the proceedings of 12th International Conference on Muon Spin Rotation, Relaxation and Resonance

Scientific paper

A significant challenge in zero-field muSR experiments arises from the uncertainty in the muon site. It is possible to calculate the dipole field (and hence precession frequency nu) at any particular site given the magnetic moment mu and magnetic structure. One can also evaluate f(nu), the probability distribution function of nu assuming that the muon site can be anywhere within the unit cell with equal probability, excluding physically forbidden sites. Since nu is obtained from experiment, what we would like to know is g(mu|nu), the probability density function of mu given the observed nu. This can be obtained from our calculated f(nu/mu) using Bayes' theorem. We describe an approach to this problem which we have used to extract information about real systems including a low-moment osmate compound, a family of molecular magnets, and an iron-arsenide compound.

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