Polarisability diamagnetic

The quantum mechanics treatment of diamagnetism has not been published. It seems probable, however, that Larmor s theorem will be retained essentially, in view of the marked similarity between the results of the quantum mechanics and those of the classical theory in related problems, such as the polarisation due to permanent electric dipoles and the paramagnetic susceptibility. f Thus we are led to use equation (30), introducing for rK2 the quantum mechanics value... 

Core-polarisation and conduction-electron polarisation effects can be studied as can exchange polarisation of diamagnetic atoms in magnetic hosts. The lattice dynamics of the metal lattice are examined via the temperature dependence of the /-factor. Many metals approximate closely to the Debye model, and a Debye temperature has some significance. Impurity doping can... 

FeSn2 is antiferromagnetic below 377 K with a field of 115 kG at 295 K. In all cases (except FesSna) a field of between 30 and 110 kG is also recorded at the tin nucleus in the Sn Mossbauer resonance (see Chapter 14). This results from exchange polarisation of the diamagnetic tin atoms by the iron [118-120],... 

Magnetic hyperfine splitting is seen at nominally diamagnetic Au in ferromagnetic alloys, presumably as a result of conduction-electron polarisation. The 6i-contribution to the conduction band becomes partially spin-unpaired by interaction with the magnetic atoms. The lines are usually only partly resolved, and the first magnetic data were not analysed successfully... 

The 5 ground state of the Eu ion has a low spin-lattice relaxation rate, and the spin-spin relaxation frequency becomes of the order of the Mossbauer state lifetime at concentrations of the order of 5% Eu " " in a diamagnetic lattice. Consequently paramagnetic relaxation phenomena have been found for Eu ions in both CaPj and CaS [49]. In zero applied field at 4-2 K the lines are partially narrowed by isotropic spiir-spin relaxation among electronic or nuclear levels, but an external magnetic field causes electronic polarisation and an increased resolution of hyperfine components. 

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