Distribution of exchange energy in a bond-alternating S=1 quantum spin chain

Details Distribution of exchange energy in a bond-alternating S=1 quantum spin chain Distribution of exchange energy in a bond-alternating S=1 quantum spin chain

2003-10-30

arxiv.org/abs/cond-mat/0310741v1

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 10 figures

Scientific paper

10.1103/PhysRevB.69.144417

The quasi-one-dimensional bond-alternating S=1 quantum antiferromagnet NTENP is studied by single crystal inelastic neutron scattering. Parameters of the measured dispersion relation for magnetic excitations are compared to existing numerical results and used to determine the magnitude of bond-strength alternation. The measured neutron scattering intensities are also analyzed using the 1st-moment sum rules for the magnetic dynamic structure factor, to directly determine the modulation of ground state exchange energies. These independently determined modulation parameters characterize the level of spin dimerization in NTENP. First-principle DMRG calculations are used to study the relation between these two quantities.

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