The Spin Dynamics of the Spin Ladder, Dimer Chain Material Sr14Cu24O41

Details The Spin Dynamics of the Spin Ladder, Dimer Chain Material Sr14Cu24O41 The Spin Dynamics of the Spin Ladder, Dimer Chain Material Sr14Cu24O41

1997-11-06

arxiv.org/abs/cond-mat/9711053v1

Physics

Condensed Matter

Submitted by anonymous ftp as 142441.pdf. 20 pages

Scientific paper

10.1103/PhysRevLett.81.1702

We have performed inelastic neutron scattering on a single crystal sample of Sr14Cu24O41 to study the spin dynamics of the Cu2O3 spin ladder layers, and CuO2 chains. Data collected with incident energies of 50 meV, 200 meV, 350 meV and 500 meV are best fitted with a dispersion with a spin gap of 32.5+/-0.1 meV and a maximum of 193.52.4 meV, consistent with a coupling along the ladders, J|| = 130 meV and a rung coupling J^=72 meV. We find that excitations with an energy transfer of approximately 11.5 meV can be described solely in terms of a dimer chain with an antiferromagnetic intra-dimer coupling, J1 = 11.2 meV, between next-nearest-neighbour Cu ions and a ferromagnetic inter-dimer coupling, J2 = -1.1 meV. The dimers are separated by two Cu ions providing a periodicity for the dimer chain of five units.

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