Magnetic excitations in a bond-centered stripe phase: Spin waves far from the semi-classical limit

Details Magnetic excitations in a bond-centered stripe phase: Spin waves far from the semi-classical limit Magnetic excitations in a bond-centered stripe phase: Spin waves far from the semi-classical limit

2004-02-16

arxiv.org/abs/cond-mat/0402377v2

Phys. Rev. Lett. 93, 127002 (2004)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figs, of possible relevance to experiments reported in cond-mat/0401621; (v2) final version as published

Scientific paper

10.1103/PhysRevLett.93.127002

Using a spin-only model, we compute spin excitation spectra in a bond-centered stripe state with long-range magnetic order. We employ a bond operator formalism, which naturally captures both dimerization and broken spin symmetry in a unified framework. At low energies, the spin excitations resemble spin waves, but at higher energies they are very similar to spin-1 excitations of isolated spin ladders. Our theory does well describe neutron scattering data [J. M. Tranquada et al., Nature 429, 534 (2004)] on LaBaCuO, pointing towards bond order in this material.

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