Spin dynamics of the spin-ladder dimer-chain material Sr14Cu24O41

Roger S. Eccleston, Masatomo Uehara, Jun Akimitsu, Hiroshi Eisaki, Naoki Motoyama, Shin Ichi Uchida

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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. Our data are best fitted with a dispersion which has a spin gap of 32.5±0.1meV and a maximum of 193.5±2.4meV, consistent with a coupling along the ladders, J=130 meV and a rung coupling J = 72 meV. Excitations with an energy transfer of approximately 11.5 meV arise from a dimer chain with an antiferromagnetic intradimer coupling J1=11.2meV between next-nearest-neighbor Cu ions, and a ferromagnetic interdimer coupling J2=−1.1meV. The dimer chains have a periodicity of five units.

Original languageEnglish
Pages (from-to)1702-1705
Number of pages4
JournalPhysical Review Letters
Issue number8
Publication statusPublished - 1998
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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