Theory of the Raman spectra of the Shastry-Sutherland antiferromagnet SrCu2(BO3)(2) doped with nonmagnetic impurities
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.
Keywords: antiferromagnetic materials ; bound states ; copper compounds ; doping ; Heisenberg model ; metal-insulator transition ; numerical analysis ; Raman spectra ; strontium compounds ; Ground-State ; Bound-States ; Spin ; Order ; Model
Record created on 2010-11-30, modified on 2016-08-09