Abstract
We report the results of Raman scattering measurements which determine the pressure dependence of the in-plane exchange coupling constant J in magnetic La 2CuO 4 for pressure between 1bar and 100 kbar. We find that pressure increases the Neel temperature T N much more rapidly than J. This result together with the theory for a quasi two-dimensional magnetic system then suggests that the interplanar exchange coupling decreases with pressure.
Highlights
Raman scattering studies of the magnetic excitations of both the oxide superconductors and their insulating parent compounds have played a central role in elucidating the importance of spin fluctuations in high temperature superconductors[1]
We report the results of Raman scattering measurements which determine the pressure dependence of the inplane exchange coupling constant J in magnetic LarCuO4 for pressures between lbar and 100 kbar
We find that pressure increases the Neel temperature TN much more rapidly than .I
Summary
Raman scattering studies of the magnetic excitations of both the oxide superconductors and their insulating parent compounds have played a central role in elucidating the importance of spin fluctuations in high temperature superconductors[1]. Both the superconductivity[2] and the magnetism[3] are remarkably sensitive to pressure, the fundamental mechanism for this remains unclear. Raman scattering has been used to study the pressure dependence of the phonons in several of these materials[4], it has not previously been used to study the effects of pressure on the spin fluctuations. We present here the first report of the pressure dependence of the two-magnon excitation spectrum of magnetic LarCuO4, directly probed by Raman scattering
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