Lattice dynamics across the magnetic transition in (Mn,Fe)1.95(P,Si)

Journal article (2018)

Authors

D. Bessas European Synchrotron Radiation Facility, RST/Fundamental Aspects of Materials and Energy - AS
M. Maschek RST/Fundamental Aspects of Materials and Energy - AS
. Yibole RST/Fundamental Aspects of Materials and Energy - AS
J. Lai RST/Fundamental Aspects of Materials and Energy - AS
S. M. Souliou European Synchrotron Radiation Facility
A. Iulian Dugulan RST/Fundamental Aspects of Materials and Energy - AS
A.I. Dugulan RST/Fundamental Aspects of Materials and Energy - AS
I. Sergueev Deutsches Elektronen-Synchrotron DESY
N.H. van Dijk RST/Fundamental Aspects of Materials and Energy - AS
E.H. Brück RST/Fundamental Aspects of Materials and Energy - AS
Research Group
RST/Fundamental Aspects of Materials and Energy (AS) (TU Delft)
Copyright: © 2018 D. Bessas, M. Maschek, . Yibole, J. Lai, S. M. Souliou, A.I. Dugulan, I. Sergueev, N.H. van Dijk, E.H. Brück
DOI: https://doi.org/10.1103/PhysRevB.97.094303
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Published Date

2018

Language

English

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Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Fundamental Aspects of Materials and Energy

Abstract

The lattice dynamics in MnFe0.95Si0.50P0.50 were investigated experimentally using Fe57 nuclear inelastic scattering and inelastic x-ray scattering across the first-order magnetic transition which occurs close to room temperature. The lattice dynamics characterization was supported by a macroscopic magnetic characterization, an x-ray diffraction study, and a hyperfine interactions characterization using Mössbauer spectroscopy. The Fe specific and the x-ray generalized density of phonon states were obtained both in the ferromagnetic and in the paramagnetic state. A prominent shift, 2meV at 20meV, in the x-ray generalized density of phonon states across the first-order magnetic transition, that involves vibrations with essentially Fe character, is revealed corroborated by a change in the local environment quantified in the isomer shift and the quadrupole splitting. Above 35meV the vibrational modes are practically insensitive to the magnetic transition. The entropy change induced by a 1T magnetic field across the magnetic transition, ∼10J/K/kg, is only a fraction of the Fe vibrational entropy change, 62(21)J/K/kg.

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