Observation of magnetic order in La1.9Sr0.1CuO4 from two-magnon Raman scattering
Y. Lin, J. Sichelschmidt, J. E. Eldridge, T. Wahlbrink, S. -W. Cheong
Abstract
We reported two-magnon Raman scattering from La1.9Sr0.1CuO4, which has a suppressed Tc=12 K, as the temperature is lowered below 37 K and an ordered spin phase is formed. The two-magnon Raman intensity increases with decreasing temperature. The magnetic scattering in La1.9Sr0.1CuO4 is totally different from that reported in the parent compound La2CuO4. We analyze the line shape of the two-magnon scattering within the traditional Loudon-Fleury theory and find the superexchange constant J=1052 cm-1. The calculation of the frequency moment suggests that the quantum fluctuations are very weak in the system. The room temperature Raman scattering from La2CuO4 is also measured. Strong features appear in the one-phonon spectrum at the frequencies of the longitudinal optical (LO) infrared modes which we suggest become Raman active through a Fröhlich-interaction.
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