High-energy spin excitations in the insulating phases of high- superconducting cuprates and
- 1 July 1990
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 42 (1), 1045-1047
- https://doi.org/10.1103/physrevb.42.1045
Abstract
High-energy spin excitations up to above 8000 were measured by polarized Raman scattering in the insulating phases of S=1/2 copper oxides, , , , , and , and an S=1 nickel oxide . All the copper oxides commonly show anomalous spectra, especially the secondary scattering peaks near 4J (J is the two-spin superexchange energy). Those anomalies are caused by the large four-spin cyclic exchange interactions. The present experiments demonstrated that the four-spin exchanges show distinctive characteristics in cuprates as compared to other materials.
Keywords
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