Structural and magnetic transitions in cubic Mn3Ga

The structural, magnetic and electron-transport properties of cubic Mn3Ga 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-princi...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2014-03, Vol.26 (12), p.126001-126001
Main Authors: Kharel, P, Huh, Y, Al-Aqtash, N, Shah, V R, Sabirianov, R F, Skomski, R, Sellmyer, D J
Format: Article
Language:English
Subjects:
Computer Simulation
Curie temperature
Electric Conductivity
Gallium - chemistry
Heusler alloy
high anisotropy
Kondo effect
Magnetic Fields
Manganese - chemistry
Materials Testing
Models, Chemical
Models, Molecular
Molecular Conformation
Phase Transition
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Summary:The structural, magnetic and electron-transport properties of cubic Mn3Ga 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.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/26/12/126001