By Richard L. Carlin
This is a textbook of what's known as magnetochemistry. We take the perspective that magnetic phenomena are attention-grabbing as a result of what they let us know approximately chemical platforms. but, we think it truly is now not tenable to write down in basic terms approximately such matters as distinguishing stereochemistry from the dimension of a magnetic susceptibility over a constrained mood ature quarter; that's, paramagnetism is so well-understood that little is still to discover that is of primary curiosity. the main function of this booklet is to direct chemists to a few of the new paintings of physicists, and specifically to a long exposition of magnetic ordering phenomena. Chemists have lengthy been attracted to magnetic interactions in clusters, yet many have shied clear of long-range ordering phenomena. Now despite the fact that extra individuals are investigating magnetic habit at temperatures within the liquid helium zone, the place ordering phenomena can scarcely be refrained from. The emphasis is on complexes of the iron-series ions, for this can be the place lots of the fresh paintings, either experimental and theoretical, has been performed. The dialogue for that reason is restricted to insulating crystals; the character of magnetism in metals and such fabrics as semiconductors is adequately various dialogue of those elements is past our reasons. The e-book is directed extra on the sensible experimentalist than on the theoretician.
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Extra resources for Magnetic Properties of Transition Metal Compounds
3. Orbach process. There is a possibility that a direct, resonant twophonon process occurs via a real intermediate state, if the paramagnetic ion has, in addition to the two ground state levels, another level at such a position that the phonons can excite the ion to this state. In this case the phonon frequencies are also determined by h(w\ - w2 ) = 6. 4 Orbach process (c) The three spin-lattice relaxation processes indicated schematicaUy. 4, where the curly arrows represent the phonons. The spin-lattice interaction mechanism has to be considered in some detail if one wants to calculate the magnitudes of the time constants that characterize these processes as well as their dependence on external magnetic field and temperature.
B 14, 1519 (1976). 7. F. P. MacDougall, ~ Am. Chern. Soc. 57, 1175 (1935). 8. C. P. Slichter, Phys. Rev. 113, 1504 (1959). 9. See, for example, Chapter 2 by R. J. Stapleton in S. , "Electron Paramagnetic Resonance," Plenum Press, New York, 1972. 10. H. van Vleck, Phys. Rev. 57, 426 (1940). 11. M. Ziman, "Electrons and Phonons," Oxford University Press, London, 1960. 12. L. Cianchi and M. Mancini, Revista del Nuovo Cimento 2, 25 (1972). 13. See, for example, C. van Dijk, Thesis, Leiden, 1970. 14.
The various symbols refer to results from different experimental techniques. The solid line is the theoretical expression of Eq. 27), corrected at high temperatures. From Ref. 15. 28). 6H20 is determined by a Kramers doublet, about 10 4 K below the other states. For samples with small Cu concentration, de Vroomen et al. (14) demonstrated that the relaxation rate ,-1 follows the H4 dependence of the direct process at strong fields (Fig. 5). The tempera- ture dependence of the Raman process is usually observed at fields of a few hundred oersteds.