1995/01/19 by J. Lorenzana, G. A. Sawatzky · 1 citation
Physics and Astronomy · #supr-con #cond-mat.supr-con #mtrl-th
paper · pdf · doi:10.1103/physrevlett.74.1867
published as Phys. Rev. Lett., 74,1867(1995) · 4 pages
arxiv created 1995/01/19 · arxiv updated 2009/11/30
We calculate the effective charge for multimagnon infrared (IR) absorption assisted by phonons in the parent insulating compounds of cuprate superconductors and the spectra for two-magnon absorption using interacting spin-wave theory. Recent measured bands in the mid IR [Perkins et al. Phys. Rev. Lett. \bf 71 1621 (1993)] are interpreted as involving one phonon plus a two-magnon virtual bound state, and one phonon plus higher multimagnon absorption processes. The virtual bound state consists of a narrow resonance occurring when the magnon pair has total momentum close to (π,0).