Static and quasielastic properties of the spiral magnetBa2CuGe2O7studied by neutron resonance spin echo spectroscopy and neutron Larmor labeling

Abstract

We provide a route to use elastic and quasielastic neutron spin echo spectroscopy (Larmor labeling) for a unified approach to study both the static and dynamic properties of incommensurate magnetic structures with small propagation vectors. The archetypal noncentrosymmetric spiral magnet ${\mathrm{Ba}}_{2}{\mathrm{CuGe}}_{2}{\mathrm{O}}_{7}$ serves as a model system for our study. We show how Larmor labeling can efficiently decouple instrumental wavelength resolution and effective-$\stackrel{P\vec}{Q}$ resolution and give high-precision access to the structural properties of the incommensurate domains of ${\mathrm{Ba}}_{2}{\mathrm{CuGe}}_{2}{\mathrm{O}}_{7}$.