What is Noncollinear Magnetism?
The terms “collinear” and “noncollinear” refer originally to a geometrical concept. Nowadays they are frequently used to classify magnetism in a rather vague sense. In the present paper an attempt is made to classify collinear and noncollinear by means of transformation properties of classical vectors (Heisenberg-like models of magnetism), and spinors and bispinors as used within a nonrelativistic and a relativistic description of magnetism based on the (local) density functional approach.
KeywordsInvariance Condition Transformation Property Translational Symmetry Spin Space Band Side
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