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

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

1999-08-24

arxiv.org/abs/cond-mat/9908347v1

Physics

Condensed Matter

5 pages, 4 figures included

Scientific paper

10.1103/PhysRevB.60.R12553

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.

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