Probing magnetic excitations, fluctuations and correlation lengths by muon spin relaxation and rotation techniques

Abstract

We first discuss magnetic excitation and relaxation processes which have already been recognized experimentally by muon spin relaxation experiments. Our examples are taken from experiments performed on strongly correlated electronic systems, magnetic metals and geometrically frustrated magnetic compounds. In another part, focusing on the flux-line lattice in the Bragg-glass phase of superconductors, we show that a muon spin experiment can provide information on the in-plane correlation length of the lattice.