Zero-field muon spin relaxation studies of frustrated magnets: physics and analysis issues

The exquisite sensitivity of zero-field muon spin relaxation to both static magnetic order and dynamic fluctuations has been used to study the ordering processes in a variety of exchange frustrated magnetic materials. Two distinct ordering events are identified, and they each clearly show both dynamic and static signatures. Phase diagrams for two classes of frustration are presented. We also provide an extensive discussion of both approximate and complete solutions to dynamic fitting functions, and show that the correct functions used in our analysis yield more accurate fits and quantitative agreement with independent measurements on the same samples.