Ab initio theory of magnetic ordering electronic origin of pair- and multi-spin interactions
著者
書誌事項
Ab initio theory of magnetic ordering electronic origin of pair- and multi-spin interactions
（Springer theses : recognizing outstanding Ph. D. research）
Springer, c2020
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注記
"Doctoral thesis accepted by University of Warwick, Coventry, UK"
Includes bibliographical references
内容説明・目次
内容説明
Many technological applications exploit a variety of magnetic structures, or magnetic phases, to produce and optimise solid-state functionality. However, most research advances are restricted to a reduced number of phases owing to computational and resource constraints. This thesis presents an ab-initio theory to efficiently describe complex magnetic phases and their temperature-dependent properties.
The central assumption is that magnetic phases evolve slowly compared with the underlying electronic structure from which they emerge. By describing how the electronic structure adapts to the type and extent of magnetic order, a theory able to describe multi-spin correlations and their effect on the magnetism at finite temperature is obtained.
It is shown that multi-spin correlations are behind the temperature and magnetic field dependence of the diverse magnetism in the heavy rare earth elements. Magnetically frustrated Mn-based materials and the effect of strain are also investigated. These studies demonstrate that the performance of solid-state refrigeration can be enhanced by multi-spin effects.
目次
Introduction.- Ab-initio Theory of Electronic Structure.- Disordered Local Moment Theory and Fast Electronic Responses.- Minimisation of the Gibbs Free Energy: Magnetic Phase Diagrams and Caloric Effects.- Pair- and Four- Spin Interactions in the Heavy Rare Earth Elements.- Frustrated Magnetism in Mn-based Antiperovskite Mn3GaN.- Summary and Outlook.- Appendix.
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