Spin-phonon coupling in spin chain cuprates
The magnetism of Heisenberg spin chains has aroused a lot of interest in the last decades. SrCuO2, Sr2CuO3 or Ca2CuO3 are emblematic realizations of this model. In those compounds, that align 180 degrees Cu-O-Cu bonds along one crystallographic axis, strong and anisotropic thermodynamic properties were found, which are due to the peculiar 1D S=1/2 magnetic excitations of the spin 1/2 chains, the spinons. At temperatures above this conduction peak, the conduction properties decay in a manner which is not yet understood. We suppose that the spin liquid excitations end up scattering with thermally activated phonons, and as their mean free path decays so does the heat conductivity. In the present experiment, we propose to take advantage of the confinement of those spinons in conventional magnons in the low temperature 3D AF ordered phase, to look for a more conventional coupling between collective modes. We want to study the formation, dispersion and temperature evolution of the peculiar low energy magnons spectrum. Furthermore, we will focus on a point of reciprocal space where magnons cross the phonon spectrum, above and below TN, to show a possible anti-crossing.
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MSIKA David; BOUNOUA Dalila; DAMAY Francoise; DEMORTIER OLIVIER; IVANOV Alexandre; PETIT Sylvain; PINSARD-GAUDART Loreynne and SAINT-MARTIN Romuald. (2021). Spin-phonon coupling in spin chain cuprates. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1690
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