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Magnetic Ions in Crystals
K.W. H. Stevens

Paperback | 2014 | $47.95 | £39.95 | ISBN: 9780691608334
Hardcover | 2016 | $119.95 | £99.95 | ISBN: 9780691636801
268 pp. | 6 x 9 | 9 line illus. 3 tables
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There have been many demonstrations, particularly for magnetic impurity ions in crystals, that spin-Hamiltonians are able to account for a wide range of experimental results in terms of much smaller numbers of parameters. Yet they were originally derived from crystal field theory, which contains a logical flaw; electrons on the magnetic ions are distinguished from those on the ligands. Thus there is a challenge: to replace crystal field theory with one of equal or greater predictive power that is based on a surer footing. The theory developed in this book begins with a generic Hamiltonian, one that is common to most molecular and solid state problems and that does not violate the symmetry requirements imposed on electrons and nuclei. Using a version of degenerate perturbation theory due to Bloch and the introduction of Wannier functions, projection operators, and unitary transformations, Stevens shows that it is possible to replace crystal field theory as a basis for the spin-Hamiltonians of single magnetic ions and pairs and lattices of magnetic ions, even when the nuclei have vibrational motion.

The power of the method is further demonstrated by showing that it can be extended to include lattice vibration and conduction by electron hopping such as probably occurs in high-Tc superconductors. Thus Stevens shows how an apparently successful ad hoc method of the past can be replaced by a much more soundly based one that not only incorporates all the previous successes but appears to open the way to extensions far outside the scope of the previously available methods. So far only some of these have been explored. The book should therefore be of great interest to all physicists and chemists concerned with understanding the special properties of molecules and solids that are imposed by the presence of magnetic ions.

Originally published in 1997.

The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.


"This is a theoretical treatment of the properties of magnetic ions in crystals. The author's challenge is to derive an effective operator of the spin-Hamiltonian form from the generic Hamiltonian of a non-magnetic crystal containing one magnetic ion."--Contemporary Physics

Table of Contents:

Chapter 1 -- Introduction
Chapter 2 -- Group Theory
Chapter 3 -- Perturbation Theory
Chapter 4 -- Crystal Field Theory
Chapter 5 -- Beyond Crystal Field Theory
Chapter 6 -- Second Quantization
Chapter 7 -- From Generic to Spin-Hamiltonian
Chapter 8 -- The Interactions between Ions
Chapter 9 -- Cooperative Systems
Chapter 10 -- Conductors
Chapter 11 -- Nuclear Symmetry


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File created: 7/11/2017

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