Journal article
Analysis of the crystallographic and magnetic structures of the Tb0.1Pr0.9Al2 and Tb0.25Pr0.75Al2 magnetocaloric compounds by means of neutron scattering
University of Copenhagen1
Brazilian Synchrotron Light Laboratory2
Department of Physics, Technical University of Denmark3
Neutrons and X-rays for Materials Physics, Department of Physics, Technical University of Denmark4
Rutherford Appleton Laboratory5
Helmholtz Centre Berlin for Materials and Energy6
Technical University of Munich7
University of Campinas8
Neutron powder diffraction and inelastic neutron scattering data were used to simulate and understand the magnetization and heat capacity curves of the pseudobinary Tbx Pr1-x Al2, with x = 0.10 and 0.25, as a function of temperature. From the Rietveld analysis, we concluded that no crystallographic transition occurs in these samples, and the high symmetry of the magnetic structure was confirmed.
Moreover, the different contributions from the reflection planes could be related to the known exchange bias-like effect characteristic for the x = 0.25 sample, also suggesting the existence of some rearrangement of the magnetic moments or even the presence of spin frustration in this system. Finally, the obtained set of theoretical parameters using the mean field approach for the two systems consisting of two sublattices allowed the experimental data to be described and to explain their physical behaviors.
The ensemble of our results leads us to affirm that the quadrupolar interactions as well as an existence of some rearrangement of the magnetic moments or a frustration play an important role in the strong unidirectional anisotropy and the exchange bias-like effect observed in this pseudobinary system.
Language: | English |
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Publisher: | Springer US |
Year: | 2015 |
Pages: | 2884-2892 |
Journal subtitle: | Full Set - Includes `journal of Materials Science Letters' |
ISSN: | 15734803 and 00222461 |
Types: | Journal article |
DOI: | 10.1007/s10853-015-8851-1 |
ORCIDs: | Christensen, Niels Bech and 0000-0003-0750-0553 |
Applied Magnetic Field Characterization and Evaluation of Materials Chemistry and Materials Science Continuum Mechanics and Mechanics of Materials Crystallography Field Cool Inelastic Neutron Material Science Materials Science, general Mechanics Polymer Sciences Quadrupolar Interaction Rietveld Analysis