Lattice dynamics of the low-dimensional Sr2CuO3
The Mott insulating spin chains system Sr2CuO3 was shown to exhibit a highly anisotropic magnetic heat conduction, which peaks at around 150 WK-1m-1 at 50K. Indeed, heat in Sr2CuO3 is conveyed by phonon and fractional S= 1/2 magnetic excitations, namely, spinons. Heat conduction by spinons occurs only along the spin chains direction and has been proven to be ballistic. The interplay between magnetic and lattice quasi-particles and chemical or structural defects during the heat transport process gives rise to various two-quasi-particles and quasi-particle-defects scattering mechanisms that govern the resulting heat conduction properties. A deepunderstanding of these different interaction paths is thus fundamental in order to have a clear insight of the heat transport process. However, such a microscopic description of the system is still lacking. We propose to measure the phonon spectra of phonon modes propagating along the spin chains and perpendicular to the spin chains in Sr2CuO3 on IN8 TAS .
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MSIKA David; BOUNOUA Dalila; DAMAY Francoise; IVANOV Alexandre; PETIT Sylvain; PINSARD-GAUDART Loreynne; PIOVANO Andrea and SAINT-MARTIN Romuald. (2019). Lattice dynamics of the low-dimensional Sr2CuO3. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-481
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