title: Element-resolved thermodynamics of magnetocaloric LaFe(13-x)Si(x).
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 in the element-resolved vibrational density of states across the first-order transition from the ferromagnetic low temperature to the paramagnetic high temperature phase of LaFe(13-x)Si(x). These changes originate from the itinerant electron metamagnetism associated with Fe and lead to a pronounced magneto-elastic softening despite the large volume decrease at the transition. The increase in lattice entropy associated with the Fe subsystem is significant and contributes cooperatively with the magnetic and electronic entropy changes to the excellent magneto- and barocaloric properties.
authors.affiliation: Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47048 Duisburg, Germany and IFW Dresden P.O. Box 270116, 01171 Dresden, Germany.
authors.forename: M E
authors.initials: ME
authors.lastname: Gruner
authors.affiliation: Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47048 Duisburg, Germany and Max Planck Institute of Microstructure Physics, 06120 Halle, Germany.
authors.forename: W
authors.initials: W
authors.lastname: Keune
authors.affiliation: Department of Physics, Ruhr-University Bochum, 44780 Bochum, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Roldan Cuenya
authors.affiliation: Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47048 Duisburg, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Weis
authors.affiliation: Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47048 Duisburg, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Landers
authors.affiliation: Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47048 Duisburg, Germany and Max Planck Institute of Microstructure Physics, 06120 Halle, Germany.
authors.forename: S I
authors.initials: SI
authors.lastname: Makarov
authors.affiliation: Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47048 Duisburg, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Klar
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: M Y
authors.initials: MY
authors.lastname: Hu
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: E E
authors.initials: EE
authors.lastname: Alp
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: J
authors.initials: J
authors.lastname: Zhao
authors.affiliation: IFW Dresden P.O. Box 270116, 01171 Dresden, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Krautz
authors.affiliation: Materials Science, TU Darmstadt, 64287 Darmstadt, Germany.
authors.forename: O
authors.initials: O
authors.lastname: Gutfleisch
authors.affiliation: Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47048 Duisburg, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Wende