On the electronic origin of the inverse magnetocaloric effect in Ni-Co-Mn-In Heusler alloys

A. N. Vasiliev, O. Heczko, O. S. Volkova, T. N. Vasilchikova, T. N. Voloshok, K. V. Klimov, W. Ito, R. Kainuma, K. Ishida, K. Oikawa, S. Fähler

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28 Citations (Scopus)

Abstract

In order to understand the electronic origin of the inverse magnetocaloric effect observed in a Ni-Co-Mn-In system we used a combination of indirect experimental probes as magnetization, resistivity and specific heat. The findings are compared with the band structure of isostructural Heusler alloys such as Ni-Mn-Ga. We suggest that the inverse magnetocaloric effect in Ni-Co-Mn-In originates from the high density of states close to Fermi energy. Within the austenite state this causes ferromagnetic band splitting. The structural change to the martensite allows an alternative way to reduce the high density of states at lower temperatures, which does not require band splitting and thus does not support ferromagnetic order.

Original languageEnglish
Article number055004
JournalJournal of Physics D: Applied Physics
Volume43
Issue number5
DOIs
Publication statusPublished - 2010 Feb 19

ASJC Scopus subject areas

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

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