Magnetic Raman scattering of insulating cuprates

1998/09/18 by J. Eroles, J. M. Eroles, C. D. Batista +3
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetism in coordination complexes #Physics of Superconductivity and Magnetism #cond-mat

paper · pdf · doi:10.1103/physrevb.59.1468

8 pages, 2 eps figures. To be published in PRB

arxiv created 1998/09/18 · openalex publication_date 1999/01/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We study the B_1g and A_1g Raman profiles of M₂CuO₄ (with M=La, Pr, Nd, Sm, Gd), Bi₂Sr₂Ca_0.5Y_0.5Cu₂O_8+y, YBa₂Cu₃O_6.2, and PrBa₂Cu_2.7Al_0.3O₇ insulating cuprates within the Loudon-Fleury theory, in the framework of an extended Hubbard model for moderate on-site Coulomb interaction U. We calculate the nonresonant contribution to these Raman profiles by using exact diagonalization techniques and analyze two types of contributing mechanisms to the line shapes: four-spin cyclic exchange and spin-phonon interactions. Although these interactions contribute to different parts of the spectra, together, they account for the enhanced linewidth and asymmetry of the B_1g mode, as well as the non-negligible intensity of the A_1g Raman line observed in these materials.

Citations

• Two-magnon scattering and the spin-phonon interaction beyond the adiabatic approximation
• Numerical calculations of theB1gRaman spectrum of the two-dimensional Heisenberg model
• Resonant Two-Magnon Raman Scattering in Antiferromagnetic Insulators