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Large uniaxial magnetostriction with sign inversion at the first order phase transition in the nanolaminated Mn2GaC MAX phase
Univ Duisburg Essen, Germany; Univ Duisburg Essen, Germany.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
Univ Duisburg Essen, Germany; Univ Duisburg Essen, Germany; Natl Univ Sci and Technol MISIS, Russia.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering. Grein Res, Iceland.
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2018 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, article id 2637Article in journal (Refereed) Published
Abstract [en]

In 2013, a new class of inherently nanolaminated magnetic materials, the so called magnetic MAX phases, was discovered. Following predictive material stability calculations, the hexagonal Mn2GaC compound was synthesized as hetero-epitaxial films containing Mn as the exclusive M-element. Recent theoretical and experimental studies suggested a high magnetic ordering temperature and non-collinear antiferromagnetic (AFM) spin states as a result of competitive ferromagnetic and antiferromagnetic exchange interactions. In order to assess the potential for practical applications of Mn2GaC, we have studied the temperature-dependent magnetization, and the magnetoresistive, magnetostrictive as well as magnetocaloric properties of the compound. The material exhibits two magnetic phase transitions. The Neel temperature is T-N similar to 507 K, at which the system changes from a collinear AFM state to the paramagnetic state. At T-t = 214 K the material undergoes a first order magnetic phase transition from AFM at higher temperature to a non-collinear AFM spin structure. Both states show large uniaxial c-axis magnetostriction of 450 ppm. Remarkably, the magnetostriction changes sign, being compressive (negative) above T-t and tensile (positive) below the T-t. The sign change of the magnetostriction is accompanied by a sign change in the magnetoresistance indicating a coupling among the spin, lattice and electrical transport properties.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP , 2018. Vol. 8, article id 2637
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-145454DOI: 10.1038/s41598-018-20903-2ISI: 000424449100015PubMedID: 29422618OAI: oai:DiVA.org:liu-145454DiVA, id: diva2:1194596
Note

Funding Agencies|Deutsche Forschungsgemeinschaft (DFG) [SA 3095/2-1]; Swedish Research Council [642-2013-8020]; Swedish Foundation for Strategic Research (SSF) through the Synergy Grant FUNCASE; Knut and Alice Wallenberg (KAW) Foundation [KAW 2015.0043]; Ministry of Education and Science of the Russian Federation in Increase Competitiveness Program of NUST "MISiS" [K3-2017-022]; DAAD Scholarship "Research Grants - Doctoral Programmes in Germany" [57214224]

Available from: 2018-04-03 Created: 2018-04-03 Last updated: 2018-04-03

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Petruhins, AndrejsIngason, Arni SigurdurPalisaitis, JustinasRosén, Johanna
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