Insights on the origin of the Tb5Ge4 magnetocaloric effect

• Type: Article in International Scientific Journal
• Date: 2017

Authors

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

Journal

Title: Physica B: Condensed Matter

Vol. 513

Pages: 72-76

ISSN: 0921-4526

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 1 Citation

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5