Tensorial properties of incommensurate crystals
The problem of characterizing the symmetry of tensorfields describing physical properties of incommensurate crystals is discussed in relation with the covariance group of the physical phenomena involved, and the superspace group symmetry of the crystals considered.
The invariance with respect to superspace group of tensorfields defined in the superpace (which is (3+d)-dimensional euclidean) leads to necessary and sufficient conditions for the physical tensorfields to reflect crystal symmetry in the incommensurate case also.
KeywordsPoint Group Symmetry Condition Covariance Group Space Group Symmetry Tensorial Property
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