Neutrons magnetic interaction

The magnetic interaction of neutrons with protons or deuterons of the CH3 (CD3) group leads to the appearance of peaks of quasielastic and inelastic scattering, corresponding to AE and EaEb... 

The following discussion is restricted to structure types of the fluorides in which cooperative magnetic interactions of this kind are present and the magnetic structures of which have been investigated by neutron diffraction. 

As may be seen from the indications above the interpretation of magnetic anomalies as caused by magnetic interactions is not at all quite clear-cut. Fortunately neutron diffraction simplifies matter as it provides a definite proof of those interactions that are cooperative all over the crystal structure and detectable therefore because of spin alignment within magnetic sublattices. Such proofs are missing up to now for the higher fluorides, however. The break-down of Hund s rule for the 4d-and 5i-ions, in most fluorides of which even the weak-field ligand fluorine causes low-spin behaviour, may account for this as well as the different nature of interactions assumed instead. 

Since the magnetic interaction vector q is known, it is possible to deduce the magnetic form factor f( ). Although possible when using unpolarized neutrons, its measurement is much more precise using polarized neutron diffraction by a (single domain) ferromagne-... 

Magnetic interactions in [OsFsk have been studied by susceptibility and neutron diffraction measurements it is magnetically ordered at TN = 6 K.759 The magnetic moment varies from 1.73 BM at 101.5 K to 2.06 BM at 295.4 K.756... 

The general cross section for the scattering of neutrons by magnetic interactions, derived from the master formula [Eq. (3.4)] and the interaction potential between a neutron and an electron with spin and momentum is derived by Marshall and... 

The neutron-atom interaction involves also the interaction between the magnetic moment associated with the spin of the neutron and the magnetic moment of the atom (this last generated by the presence of unpaired electrons). This allows the investigation of magnetic structures, whose magnetic scattering does decline with sin 0/2. 

In INS a beam of monochromatic neutrons is fired at the sample under the study. The magnetic interaction between the neutrons (spin 1/2 particles) and the sample leads to scattering of the neutrons, with energy gain and loss, inducing transitions within the sample with the selection rules A5 = 0, 1 and AMs = 0, 1. Thus, INS can give direct information not only on ZES interactions (as in EPR) but also inter-multiplet splittings,... 

Neutron-nucleus interaction. A neutron interacts with a nucleus via nuclear and magnetic forces. For the nuclear part, since nuclear interactions are very short range compared to the(thermal) neutron wavelength, it can be shown that the interaction potential between a neutron located at r and a nucleus i located at r can be written as... 

Neutrons have a magnetic moment of 1.94 Bohr magnetons and therefore they are sensitive to magnetic interactions in solids, for which they traditionally have been a favourite probe. 

---