Evolution of magnetostructural transition and magnetocaloric effect with Al doping in MnCoGe1-xAlx compounds

Lifu Bao, Fengxia Hu, Rongrong Wu, Jianping Wang, Liming Chen, Jirong Sun, Baogen Shen, Lain-Jong Li, Bei Zhang, Xixiang Zhang

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

The effect of Al doping in MnCoGe1-xAlx compounds has been investigated. The substitution of Al for Ge enhances Mn-Mn covalent bonding by shortening the distance of nearest Mn atom layers, and thus stabilizes the hexagonal structure. As a result, first-order magnetostructural transition between ferromagnetic martensite and paramagnetic austenite takes place for the optimized compositions (x = 0.01, 0.02). Accompanied with the magnetostructural transition, large magnetocaloric effect (MCE) is observed. More doping of Al(x = 0.03, 0.04) leads to the separation of magnetic and structural transitions and remarkable reduction of MCE. © 2014 IOP Publishing Ltd.
Original languageEnglish (US)
Pages (from-to)055003
JournalJournal of Physics D: Applied Physics
Volume47
Issue number5
DOIs
StatePublished - Jan 3 2014

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Acoustics and Ultrasonics
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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