| Autor: |
Cracknell, A.P., Tooke, A.O. |
| Předmět: |
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| Zdroj: |
Contemporary Physics; Jan/Feb79, Vol. 20 Issue 1, p55, 28p, 5 Diagrams, 2 Charts, 19 Graphs |
| Abstrakt: |
This article discusses the contribution to the specific heat capacity that arises from thermal fluctuations in a magnetically-ordered solid. It considers three temperature ranges, (a) below, (b) in the neighborhood of, and (c) above T which is the critical temperatures for the existence of the magnetic ordering. For the lowest of these ranges spin-wave theory is applied, and the successes and shortcomings of simple spin-wave dispersion relations and of simple power-law expressions are discussed. Next, more realistic spin-wave dispersion relations, the renormalization of spin-wave energies, and the properties of low-dimensional magnets are considered. For temperatures around T the discussion is based on the use of critical exponents. Above T the magnetic specific heat capacity is related to the magnetic entropy associated with the persistence of short-range magnetic order. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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