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Journal Article

Element-Resolved Thermodynamics of Magnetocaloric LaFe13−xSix

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PhysRevLett.114.057202.pdf
(Publisher version), 994KB

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Citation

Gruner, M. E., Keune, W., Roldan Cuenya, B., Weis, C., Landers, J., Makarov, S. I., et al. (2015). Element-Resolved Thermodynamics of Magnetocaloric LaFe13−xSix. Physical Review Letters, 114: 057202. doi:10.1103/PhysRevLett.114.057202.


Cite as: http://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 LaFe13−xSix. 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.