Dynamics of spin fluctuations in lanthanum cuprate
K. B. Lyons, P. A. Fleury, J. P. Remeika, A. S. Cooper, T. J. Negran
DOI 10.1103/PhysRevB.37.2353 · Physical Review B
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Abstract
Raman scattering studies of La2CuO4 have revealed a high-frequency component (∼3000 cm−1) which we interpret as due to scattering by magnon pairs. Comparison of the spectra with those of K2NiF4 leads to a value of J∼1100 cm−1 for the exchange interaction. The two-dimensional nature of the fluctuations suggested by earlier neutron scattering work is indicated here by the insensitivity of the spectra to temperature as well as to departures from stoichiometry which strongly influence the three-dimensional ordering temperature TN.
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