Substitution study on the spin-Peierls compound CuGeO3 using Raman scattering

Lemmens, P.; Udagawa, M.; Fischer, M.; Güntherodt, G.; Weiden, M.; Richter, W.; Geibel, C.; Steglich, F.

doi:10.1007/BF02570981

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Substitution study on the spin-Peierls compound CuGeO₃ using Raman scattering

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Lemmens, P., Udagawa, M., Fischer, M., Güntherodt, G., Weiden, M., Richter, W., et al. (1996). Substitution study on the spin-Peierls compound CuGeO₃ using Raman scattering. Czechoslovak journal of physics, 46, 1979-1980. doi:10.1007/BF02570981.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-E639-9

Abstract

The substitution of Zn on the Cu-site and Si on the Ge-site of CuGeO3 quenches the spin-Peierls state. All substitutions lead to a suppression of the spin-Peierls gap seen below T-SP=14K at 30 cm(-1) and to a change of the temperature dependence of the spinon continuum at 200-350 cm(-1) attributed to a frustration induced Heisenberg exchange scattering. A substitution of Zn on the Cu-site has the strongest effect. The change of the continuum results from a local depression of the spin-Peierls gap near the impurity.