High-energy spin excitations in the insulating phases of high-Tc superconducting cuprates and La2NiO4

S. Sugai, M. Sato, T. Kobayashi, J. Akimitsu, T. Ito, H. Takagi, S. Uchida, S. Hosoya, T. Kajitani, T. Fukuda

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Abstract

High-energy spin excitations up to above 8000 cm-1 were measured by polarized Raman scattering in the insulating phases of S=1/2 copper oxides, La2CuO4, YBa2Cu3O6.2, Bi2Sr2Ca0.5Y0.5Cu2O8+y, Nd2CuO4, and Pr2CuO4, and an S=1 nickel oxide La2NiO4. 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.

Original languageEnglish
Pages (from-to)1045-1047
Number of pages3
JournalPhysical Review B
Volume42
Issue number1
DOIs
Publication statusPublished - Jan 1 1990
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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    Sugai, S., Sato, M., Kobayashi, T., Akimitsu, J., Ito, T., Takagi, H., Uchida, S., Hosoya, S., Kajitani, T., & Fukuda, T. (1990). High-energy spin excitations in the insulating phases of high-Tc superconducting cuprates and La2NiO4. Physical Review B, 42(1), 1045-1047. https://doi.org/10.1103/PhysRevB.42.1045