TY - JOUR
T1 - High-energy spin excitations in the insulating phases of high-Tc superconducting cuprates and La2NiO4
AU - Sugai, S.
AU - Sato, M.
AU - Kobayashi, T.
AU - Akimitsu, J.
AU - Ito, T.
AU - Takagi, H.
AU - Uchida, S.
AU - Hosoya, S.
AU - Kajitani, T.
AU - Fukuda, T.
PY - 1990/1/1
Y1 - 1990/1/1
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.42.1045
DO - 10.1103/PhysRevB.42.1045
M3 - Article
AN - SCOPUS:0000033843
VL - 42
SP - 1045
EP - 1047
JO - Physical Review B
JF - Physical Review B
SN - 0163-1829
IS - 1
ER -