High energy Spinon-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. Those exceptional properties are due to the peculiar 1D S=1/2 magnetic excitations of the spin chains, the spinons. At temperatures above the conduction peak (22K), the conduction properties decay in a manner which is not yet understood. Spin excitations end up scattering with thermally activated phonons, and as their mean free path decays so does the heat conductivity. Recently, Chen et al. measured the thermal conductivity of Ca2CuO3 and conclude from transport measurements that spinon scatter with phonons empirically. On the basis of a DFT calculation, they claim that two specific optical phonons at 25 and 75 meV, polarized along the spin chain, scatter with the spinons. As the argument of the chemical bond modulation is compelling, and could be the origin of the dissipation of spinon's energy, we want to show this spin-lattice coupling by a spectroscopic measurement.
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The recommended format for citing this dataset in a research publication is in the following format:
MSIKA David; BOUNOUA Dalila; DAMAY Francoise; IVANOV Alexandre; PETIT Sylvain; PINSARD-GAUDART Loreynne and SAINT-MARTIN Romuald. (2020). High energy Spinon-phonon coupling in spin chain cuprates. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-532
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This data is not yet public
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