Four-spin interaction as an effective interaction in high-Tc copper oxides

H. J. Schmidt, Y. Kuramoto

Research output: Contribution to journalArticlepeer-review

73 Citations (Scopus)


The lowest states of an undoped copper-oxide cluster are determined numerically and fitted by a spin Hamiltonian containing a cyclic 4-spin exchange interaction. The size of this interaction is found to be about a quarter of the size of the nearest-neighbor Heisenberg exchange. The 4-spin exchange leads to a renormalization of spin-wave properties and to extra features in magnetic Raman scattering. The calculated exchange parameters are consistent with the observed spin-wave velocity.

Original languageEnglish
Pages (from-to)263-266
Number of pages4
JournalPhysica C: Superconductivity and its applications
Issue number3-4
Publication statusPublished - 1990 May 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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