ISSN:
1572-9605
Keywords:
Antiferromagnetism
;
Optical properties
;
Heisemberg model
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract Recent measured bands in the mid IR of parent insulating compounds of cuprate superconductors [Perkins et al. Phys. Rev. Lett.71 1621 (1993)] are interpreted as multimagnon infrared (IR) absorption assisted by phonons. We present results for the coupling constant of light with this excitations and exact diagonalization results for the spectra and compare with interacting spin wave theory. The observed structures correspond to the absorption of one phonon plus two magnons and one phonon plus higher multimagnon absorption processes. Our results imply that IR absorption can be used as a unique probe of quantum antiferromagnetic systems.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00727427
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