Abstract
Abstract We present a theory of molecular contributions to magnetoelectric tensors for anisotropic linear media, due to induced moments at electric quadrupole–magnetic dipole order. This includes a constraint-breaking pseudoscalar (axion) X , evaluated relative to crystallographic axes. In general, the crystal point groups are classified according to the structures they permit for these tensors, including whether non-zero X (and hence violation of the Post constraint) is allowed. The calculated macroscopic observable X is origin independent (dependent) if the time-odd electric dipole–electric dipole polarizability density α ¯ i j ′ = 0 ( ≠ 0 ) ; a feature that prompts an analogy with the Buckingham effect.
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