Insights on the origin of the Tb5Ge4 magnetocaloric effect

• Tipo: Artigo em Revista Científica Internacional
• Data: 2017

Autores

Belo, JH (Autor) Outra; Barbosa, MB (Autor) Outra; Pires, AL (Autor) Outra; Costa, RM (Autor) Outra; Teixeira, JGV (Autor) Outra; Silva, J (Autor) Outra; Algarabel, PA (Autor) Outra; Magen, C (Autor) Outra; Morellon, L (Autor) Outra; Amaral, JS (Autor) Outra; Zeitler, U (Autor) Outra; Veerendra, G (Autor) Outra; dos Santos, M (Autor) Outra; Ren, Y (Autor) Outra; Ibarra, MR (Autor) Outra; araujo, j. p. (Autor) FCUP; pereira, a. m. (Autor) FCUP

Revista

Título: Physica B: Condensed Matter

Vol. 513

Páginas: 72-76

ISSN: 0921-4526

Editora: Elsevier

Indexação

ISI Web of Knowledge - 1 Citação

Scopus - 1 Citação

Outras Informações

ID Authenticus: P-00M-HMD

DOI: 10.1016/j.physb.2017.03.009

Abstract (EN): 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 5