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Proceedings Paper

Phonon-assisted IR spectroscopy of quantum antiferromagnets
Author(s): Jose Lorenzana; R. Eder; George A. Sawatzky
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Paper Abstract

We review recent theoretical results for multimagnon-phonon assisted infrared absorption in antiferromagnetic Heisenberg systems. We show spin wave theory line shapes for 2D spin 1/2 systems (like the parent insulating high-Tc cuprates) 1D spin 1/2 systems and 2D spin 1 systems (like the nickelates) and exact diagonalization results in two-dimensional spin 1/2 systems. The theoretical line shapes are compared with experiments. In the case of cuprates they explain mid-infrared peaks observed in the insulator. In the case of the nickelates a predicted line shape is also shown to agree with the experiments. We discuss the possibility to observe these excitations in other experiments.

Paper Details

Date Published: 10 June 1996
PDF: 9 pages
Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); doi: 10.1117/12.241761
Show Author Affiliations
Jose Lorenzana, Lab. Leon Brillouin (France)
R. Eder, Univ. Groningen (Netherlands)
George A. Sawatzky, Univ. Groningen (Netherlands)

Published in SPIE Proceedings Vol. 2696:
Spectroscopic Studies of Superconductors
Ivan Bozovic; Dirk van der Marel, Editor(s)

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