Element-Resolved Thermodynamics of Magnetocaloric LaFe13−xSix

Gruner, M. E.; Keune, W.; Roldan Cuenya, Beatriz; Weis, C.; Landers, J.; Makarov, S. I.; Klar, D.; Hu, M. Y.; Alp, E. E.; Zhao, J.; Krautz, M.; Gutfleisch, O.; Wende, H.

doi:10.1103/PhysRevLett.114.057202

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Element-Resolved Thermodynamics of Magnetocaloric LaFe_13−xSi_x

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Gruner, M. E., Keune, W., Roldan Cuenya, B., Weis, C., Landers, J., Makarov, S. I., et al. (2015). Element-Resolved Thermodynamics of Magnetocaloric LaFe_13−xSi_x. Physical Review Letters, 114(5): 057202. doi:10.1103/PhysRevLett.114.057202.

Cite as: https://hdl.handle.net/21.11116/0000-0006-BD02-3

Abstract

By combination of two independent approaches, nuclear resonant inelastic x-ray scattering and first-principles calculations in the framework of density functional theory, we demonstrate significant changes inthe element-resolved vibrational density of states across the first-order transition from the ferromagneticlow temperature to the paramagnetic high temperature phase of LaFe_13−xSi_x. These changes originate fromthe itinerant electron metamagnetism associated with Fe and lead to a pronounced magneto-elasticsoftening despite the large volume decrease at the transition. The increase in lattice entropy associated withthe Fe subsystem is significant and contributes cooperatively with the magnetic and electronic entropychanges to the excellent magneto- and barocaloric properties.