Novel Nonreciprocal Acoustic Effects in Antiferromagnets

Details Novel Nonreciprocal Acoustic Effects in Antiferromagnets Novel Nonreciprocal Acoustic Effects in Antiferromagnets

1998-11-23

arxiv.org/abs/cond-mat/9811318v1

Europhys. Lett., Vol. 45, 242 1999

Physics

Condensed Matter

Euro. Phys. Lett. (in press)

Scientific paper

10.1209/epl/i1999-00153-2

The possible occurrence of nonreciprocal acoustic effects in antiferromagnets in the absence of an external magnetic field is investigated using both (i) a microscopic formulation of the magnetoelastic interaction between spins and phonons and (ii) symmetry arguments. We predict for certain antiferromagnets the existence of two new nonreciprocal (non-time invariant) effects: A boundary-condition induced nonreciprocal effect and the occurrence of transversal phonon modes propagating in opposite directions having different velocities. Estimates are given and possible materials for these effects to be observed are suggested.

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