Insights on the origin of the Tb5Ge4 magnetocaloric effect
authors Belo, JH; Barbosa, MB; Pires, AL; Costa, RM; Teixeira, JGV; Silva, J; Algarabel, PA; Magen, C; Morellon, L; Amaral, JS; Zeitler, U; Veerendra, G; dos Santos, M; Ren, Y; Ibarra, MR; Araujo, JP; Pereira, AM
nationality International
journal PHYSICA B-CONDENSED MATTER
author keywords Magnetocaloric effect; Phase diagram; Magnetic phase transitions; Structure of crystalline solids
keywords MAGNETIC REFRIGERATION; NANOSCALE ZIPPERS; TEMPERATURE
abstract In 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 (Delta E= 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 Delta H= 7 T.
publisher ELSEVIER SCIENCE BV
issn 0921-4526
isbn 1873-2135
year published 2017
volume 513
beginning page 72
ending page 76
digital object identifier (doi) 10.1016/j.physb.2017.03.009
web of science category Physics, Condensed Matter
subject category Physics
unique article identifier WOS:000398059900012
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journal impact factor 1.453
5 year journal impact factor 1.374
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