Theory of Non-Reciprocal Optical Effects in Antiferromagnets: The Case Cr_2O_3

Details Theory of Non-Reciprocal Optical Effects in Antiferromagnets: The Case Cr_2O_3 Theory of Non-Reciprocal Optical Effects in Antiferromagnets: The Case Cr_2O_3

1996-02-29

arxiv.org/abs/cond-mat/9602159v2

Phys. Rev. B, Vol.54, 433 (1996)

Physics

Condensed Matter

accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.54.433

A microscopic model of non-reciprocal optical effects in antiferromagnets is developed by considering the case of Cr_2O_3 where such effects have been observed. These effects are due to a direct coupling between light and the antiferromagnetic order parameter. This coupling is mediated by the spin-orbit interaction and involves an interplay between the breaking of inversion symmetry due to the antiferromagnetic order parameter and the trigonal field contribution to the ligand field at the magnetic ion. We evaluate the matrix elements relevant for the non-reciprocal second harmonic generation and gyrotropic birefringence.

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