Small-moment magnetism

Muon-induced effects are sometimes invoked in a number of heavy-fermion and related systems where jxSR led to the worrisome discovery of anomalously small but non-zero magnetic moments (see sect. 9). In some instances these moments are below 10 Ub, which makes them undetectable by other methods, except by resonant photon scattering in the light actinides. Full confirmation of small moments first detected by [xSR occurred in cases where those moments had reached a size (pi w 510" Ub) accessible to neutron scattering under favorable conditions. So, extremely small moment magnetism is in all likelihood an intrinsic property of many heavy-fermion compoimds. 

As has been said at the b iiming, [iSR is not a good technique to detect the delocalization of f electrons in anomalous lanthanide and actinide materials. Yet, the formation of small-moment magnetism is clearly connected to a hybridization of f-electron states and in that sense [iSR detects magnetic non-localized electron states with high sensitivity. 

As a direct application of electric molecular terms we calculate the corresponding magnetic moments by studying the polarization of electronic (hole) states in a small external magnetic field. For a field H in z-direction we add to the potential (5) a... 

Superparamagnetic solids have a net magnetization that enhances the sum of individual moments, all of which can easily reoriented by a small external magnetic field. 

In the case of AlNis alloy our self-consistent calculations give a rather small spin-magnetic moment, for each Ni atom ... 

If M/H is not small, the magnetic moments of the particles interact, and a better approximation is (Shliomis 1974 Rosenzweig 1985) ... 

---