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Insights on the origin of the Tb5Ge4 magnetocaloric effect

AuthorsBelo, J. H.; Barbosa, Marcelo B.; Pires, A. L.; Costa, Rui M.; Teixeira, J.G.V.; Silva-Treviño, J.; Algarabel, Pedro A. ; Magen, Cesar; Morellón, Luis; Amaral, J. S.; Zeitler, U.; Veerendra, G.; Santos, A. M. dos; Ren, Y.; Ibarra, M. Ricardo; Araújo, J. P.; Pereira, A. M.
KeywordsMagnetocaloric effect
Phase diagram
Magnetic phase transitions
Structure of crystalline solids
Issue Date2017
CitationPhysica B: Condensed Matter 513: 72-76 (2017)
AbstractIn this report the magnetic, atomic structures and spin-lattice coupling have been thoroughly studied through high magnetic field magnetometry, Synchrotron X-ray diffraction under applied magnetic field and magnetostriction measurements in the Tb5Ge4 compounds. A field induced phase transition from an antiferromagnetic towards a ferromagnetic ordering was confirmed but with absence of structural transformation. This absence has been confirmed experimentally through synchrotron x-ray diffraction under applied field (up to 30 T). Moreover, this absence was explained via a thermodynamic free energy model: first principles calculations determined a large energy gap (ΔE=0.65 eV) between the two possible structures, O(I) and O(II). From magnetic and structural properties, a H-T phase diagram has been proposed for Tb5Ge4. Finally it was observed a large magnetostriction (up to 600 ppm) induced by ∆H=7 T.
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