Structural and magnetic transitions in cubic Mn3Ga

P. Kharel, Y. Huh, N. Al-Aqtash, V. R. Shah, R. F. Sabirianov, R. Skomski, D. J. Sellmyer

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Abstract

The structural, magnetic and electron-transport properties of cubic Mn 3Ga have been investigated. The alloys prepared by arc melting and melt-spinning show an antiferromagnetic spin order at room temperature but undergo coupled structural and magnetic phase transitions at 600 and 800 K. First-principles calculations show that the observed magnetic properties are consistent with that of a cubic Mn3Ga crystallizing in the disordered Cu3Au-type structure. The samples exhibit metallic electron transport with a resistance minimum near 30 K, followed by a logarithmic upturn below the minimum. The observed anomaly in the low-temperature resistivity has been discussed as a consequence of electron scattering at the low-lying excitations of the structurally disordered Mn3Ga lattice.

Original languageEnglish (US)
Article number126001
JournalJournal of Physics Condensed Matter
Volume26
Issue number12
DOIs
Publication statusPublished - Mar 26 2014

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Keywords

  • Curie temperature
  • Heusler alloy
  • Kondo effect
  • high anisotropy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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