Magnetic excitation spectrum

FIGURE 3.15 (a) Lowest section of the magnetic excitation spectrum as derived from an... 

The magnetic excitation spectrum has an hourglass shape . The dispersion at high energies is very similar to the one arising from antiferromagnetic spin-wave... 

Spin-Wave Spectrum in the Presence of Spin Vortices The Origin of an Hourglass-Shaped Magnetic Excitation Spectrum... 

Neutron scattering experiments (Mason et al. 1992, Kadowaki et al. 1994a) demonstrated the formation of a gap in the magnetic excitation spectrum well below T. Hence,... 

This energy separation has also been derived from inelastic neutron scattering determinations of the magnetic excitation spectrum of Pr. The excitations in a singlet ground state system are known as magnetic excitons and their dispersion is given by... 

The differential cross section for magnetic scattering is proportional to the imaginary part of the dynamic susceptibility or the magnetic excitation spectrum... 

It has been shown above how the magnetic excitations look like within the effective-interaction model. In that model the conduction electrons have been eliminated and their influence has been replaced by an effective interaction between the RE-ions. This way all the information has been lost concerning the dynamics of the conduction electrons. Therefore the excitation spectrum calculated within that model will be only approximately correct and erroneous in those parts in 4-space in which the dynamics of the conduction electrons is of importance (Fulde and Peschel, 1972). The purpose of this paragraph is to demonstrate explicitly the influence of the conduction electrons on the magnetic excitation spectrum. 

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