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Stark Effects in Rutile Antiferromagnets

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1 Author(s)
Halley, J.Woods ; Department of Physics, University of Minnesota, Minneapolis, Minnesota

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We show that, as a consequence of the fact that the Bogoliubov transformation mixes spin waves on different sublattices, the phenomenological Loudon Hamiltonian describing the two spin‐wave absorption in rutile antiferromagnets also predicts a linear Stark effect on the two spin‐wave line in these materials in the presence of dc electric fields. We present calculated line shapes for ir absorption in a dc field. The dc field needed to observe significant effects is of order 106 V/cm. The Stark‐effect experiment could be used to measure the parameter of the Loudon Hamiltonian, which is of interest from a theoretical point of view, since some mechanisms of two spin‐wave absorption predict π2=0. The Stark effect also provides the possibility in principle of producing a phase transition in these antiferromagnets by the application of a dc electric field. This is the case because the shift in the spin‐wave energy produced by the dc field can be negative for some values of k. We study this possibility in a simple approximation. The required fields are too large to be realizable in rutile antiferromagnets but there is some hope of observing such transitions in other kinds of antiferromagnets.

Published in:

Journal of Applied Physics  (Volume:40 ,  Issue: 3 )