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

H. J. Schmidt; Y. Kuramoto

doi:10.1016/0921-4534(90)90339-G

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

H. J. Schmidt, Y. Kuramoto

SCI - Physics

Research output: Contribution to journal › Article › peer-review

71 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	263-266
Number of pages	4
Journal	Physica C: Superconductivity and its applications
Volume	167
Issue number	3-4
DOIs	https://doi.org/10.1016/0921-4534(90)90339-G
Publication status	Published - 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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AB - 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.

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