Exchange-Induced Magnetic Dipole Mechanism of Magnon Sideband

Abstract:

We propose a new mechanism of exciton-magnon absorption in the 1D Heisenberg antiferromagnet KCuF3. It yields the correct description of the relative intensity of the spectral lines in both polarizations E c and E‖c. The magnon density of states has been calculated. The origin of the fine sideband structure in KCuF3 can be explained. The sharp magnon lines, observed in Ref. [1], correspond to the low energy singularities in the magnon density of states.

• Periodical: Solid State Phenomena (Volumes 168-169)
• Pages: 113-116
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.168-169.113
• Online since: December 2010
• Authors: Mikhail V. Eremin, Joachim Deisenhofer, M.A. Fayzullin, C. Kant, Alois Loidl
• Keywords: 1D Antiferromagnet, Magnon Sideband, Optical Transition

References

[1] J. Deisenhofer, I. Leonov, M.V. Eremin et al.: Phys. Rev. Lett., Vol. 101 (2008), p.157406 (2008).

[2] Y. Tanabe, K. -I. Gondaira: J. Phys. Soc. Japan, Vol. 22, p.573 (1967).

[3] Y. Tanabe, T. Moriya, S. Sugano: Phys. Rev. Lett., Vol. 15 (1965), p.1023.

[4] M. V. Eremin, D. V. Zakharov et al.: Phys. Rev. Lett., Vol. 101 (2008), p.147601.

[5] S.K. Satija, J.D. Axe, G. Shirane et al.: Phys. Rev. B, Vol. 21 (1980), p. (2001).

[6] B. Lake, D.A. Tennant, S.E. Nagler: Phys. Rev. B, Vol. 71 (2005), p.134412.

[7] J. B. Parkinson, R. Loudon, J. Phys. C. (Proc. Phys. Soc. ), Vol. 1 (1968), p.1568.