Electron Spin Resonance of defects in the Haldane System Y(2)BaNiO(5)

Abstract

We calculate the electron paramagnetic resonance (EPR) spectra of the antiferromagnetic spin-1 chain compound Y(2)BaNi(1-x)Mg(x)O(5) for different values of x and temperature T much lower than the Haldane gap (~100K). The low-energy spectrum of an anisotropic Heisenberg Hamiltonian, with all parameters determined from experiment, has been solved using DMRG. The observed EPR spectra are quantitatively reproduced by this model. The presence of end-chain S=1/2 states is clearly observed as the main peak in the spectrum and the remaining structure is completely understood.

5 pages, 4 figures included

References in corpus (2)

• Specific Heat of defects in the Haldane System Y_2BaNiO_5
• Spin dynamics of hole doped Y2BaNiO5

Cited by in corpus (11)

• The density-matrix renormalization group
• New Trends in Density Matrix Renormalization
• Topological phases with long-range interactions
• Magnetization and dimerization profiles of the cut two-leg spin ladder and spin-1 chain
• Paramagnetic and antiferromagnetic resonances in the diamagnetically diluted Haldane magnet PbNi2V2O8
• Local probe of fractional edge states of S=1 Heisenberg spin chains
• Evidence of quantum criticality in the doped Haldane system Y2BaNiO5
• Boundary Resonances in S = 1/2 Antiferromagnetic Chains under a Staggered Field
• Magnetization profiles and NMR spectra of doped Haldane chains at finite temperatures
• Angular-time evolution for the Affleck-Kennedy-Lieb-Tasaki chain and its edge-state dynamics
• Characterization of localized effective spins in gapped quantum spin chains