Theory of the Raman spectra of the Shastry-Sutherland antiferromagnetSrCu2(BO3)2doped with nonmagnetic impurities

2009/02/28 by Sylvain Capponi, S. Capponi, Didier Poilblanc +3
Earth and Planetary Sciences · Physics and Astronomy · #Advanced Condensed Matter Physics #High-pressure geophysics and materials #Physics of Superconductivity and Magnetism #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.80.094407

published as Phys. Rev. B 80, 094407 (2009) · slightly extended published version; 6 pages, 5 figures

openalex publication_date 2009/09/15 · arxiv created 2009/09/17 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04

Abstract

Controlled doping of SrCu₂(BO₃)₂, a faithful realization of the Heisenberg spin-1/2 antiferromagnet on the Shastry-Sutherland lattice, with nonmagnetic impurities generates bound states below the spin gap. These bound states and their symmetry properties are investigated by exact diagonalization of small clusters and within a simple effective model describing a spinon submitted to an attractive extended potential. It is shown that Raman spectroscopy is a unique technique to probe these bound states. Quantitative theoretical Raman spectra are numerically obtained.

Citations

• Impurity-induced singlet breaking inSrCu2(BO3)2
• Spin-polaron excitations in a doped Shastry-Sutherland model
• Quantum impurity in an antiferromagnet: Nonlinear sigma model theory
• Dispersion and Symmetry of Bound States in the Shastry-Sutherland Model