Magnetic properties of (VO)_2P_2O_7: two-plane structure and spin-phonon interactions

Details Magnetic properties of (VO)_2P_2O_7: two-plane structure and spin-phonon interactions Magnetic properties of (VO)_2P_2O_7: two-plane structure and spin-phonon interactions

2000-10-11

arxiv.org/abs/cond-mat/0010168v1

Phys. Rev. B 63, 134418 (2001).

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 9 figures

Scientific paper

10.1103/PhysRevB.63.134418

Detailed experiments on single-crystal (VO)_2P_2O_7 continue to reveal new and unexpected features. We show that a model composed of two, independent planes of spin chains with frustrated magnetic coupling is consistent with nuclear magnetic resonance and inelastic neutron scattering measurements. The pivotal role of PO_4 groups in mediating intrachain exchange interactions explains both the presence of two chain types and their extreme sensitivity to certain lattice vibrations, which results in the strong magnetoelastic coupling observed by light scattering. We compute the respective modifications of the spin and phonon dynamics due to this coupling, and illustrate their observable consequences on the phonon frequencies, magnon dispersions, static susceptibility and specific heat.

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