Mixed magnetism in magnetocaloric materials with first-order and second-order magnetoelastic transitions

Maurits Boeije, Michael Maschek, Xue-Fei Miao, Thang Nguyen, Niels van Dijk, Ekkes Brück

Research output: Contribution to journalArticleScientificpeer-review

21 Citations (Scopus)
116 Downloads (Pure)

Abstract

Temperature dependent high-resolution x-ray diffraction measurements were used to characterize the magneto-elastic ferromagnetic transition of (Fe,Mn)2(P,Si,B) compounds. Across the transition, apart from a change in lattice parameters across the transition, the internal coordinates of Mn and Fe also change. This intrinsic degree of freedom allows Fe in the tetrahedral coordination to decrease the two interatomic distances with the 2c position and increase the two distances with the two 1b position, while the Fe–Mn distance remains constant. For Mn in the square based pyramidal coordination, all interatomic distances effectively remain constant. Electron density plots show that for second-order transitions, the observed changes are smaller and continuously extending over a wide temperature range in the ferromagnetic and paramagnetic states, due to short-range order. This study shows that the mechanism behind the phase transition in Fe2P-based materials is an isostructural transition that is equal for both first- and second-order transitions.
Original languageEnglish
Article number174002
Pages (from-to)1-8
Number of pages8
JournalJournal of Physics D: Applied Physics
Volume50
Issue number17
DOIs
Publication statusPublished - 31 Mar 2017

Keywords

  • giant magnetocaloric effect
  • first-order phase transitions
  • electron density plots
  • magnetoelastic coupling
  • x-ray diffraction

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