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Unusual Electrical Transport Driven by the Competition between Antiferromagnetism and Ferromagnetism in Antiperovskite Mn3Zn1−xCoxN

by Lihua Chu 1,*,†, Lei Ding 2,*,†, Cong Wang 3, Meicheng Li 1, Yanjiao Guo 1 and Zhuohai Liu 1
1
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, School of Renewable Energy, North China Electric Power University, Beijing 102206, China
2
ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Harwell Oxford, Didcot OX11 0QX, UK
3
Center for Condensed Matter and Materials, Department of Physics, Beihang University, Beijing 100191, China
*
Authors to whom correspondence should be addressed.
Those authors contributed equally to this work.
Materials 2018, 11(2), 286; https://doi.org/10.3390/ma11020286
Received: 5 January 2018 / Revised: 5 February 2018 / Accepted: 9 February 2018 / Published: 12 February 2018
The magnetic, electrical transport and thermal expansion properties of Mn3Zn1−xCoxN (x = 0.2, 0.4, 0.5, 0.7, 0.9) have been systematically investigated. Co-doping in Mn3ZnN complicates the magnetic interactions, leading to a competition between antiferromagnetism and ferromagnetism. Abrupt resistivity jump phenomenon and negative thermal expansion behavior, both associated with the complex magnetic transition, are revealed in all studied cases. Furthermore, semiconductor-like transport behavior is found in sample x = 0.7, distinct from the metallic behavior in other samples. Below 50 K, resistivity minimum is observed in samples x = 0.4, 0.7, and 0.9, mainly caused by e-e scattering mechanism. We finally discussed the strong correlation among unusual electrical transport, negative thermal expansion and magnetic transition in Mn3Zn1−xCoxN, which allows us to conclude that the observed unusual electrical transport properties are attributed to the shift of the Fermi energy surface entailed by the abrupt lattice contraction. View Full-Text
Keywords: magnetic properties; electrical properties; negative thermal expansion; antiperovskite magnetic properties; electrical properties; negative thermal expansion; antiperovskite
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Chu, L.; Ding, L.; Wang, C.; Li, M.; Guo, Y.; Liu, Z. Unusual Electrical Transport Driven by the Competition between Antiferromagnetism and Ferromagnetism in Antiperovskite Mn3Zn1−xCoxN. Materials 2018, 11, 286.

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