Abnormal thermal expansion and correlated magnetic, electronic
transport in antiperovskite Mn3XN compounds
Cong Wang1, Ying Sun1, Sihao Deng1, Kewen Shi1, Imran Malik1, Lei Wang1, Qinzhen Huang2
1.Center for Condensed Matter and Materials Physics, Dept. of Physics, Beihang University,
100191, Beijing, P. R. CHINA
2. NIST Center for Neutron Research, NIST, Gaithersburg，Maryland, USA
Antiperovskite structured Mn3XN (X=Ga, Zn, Cu, Sn, etc.) have attracted
great attentions due to their rich physical properties and important applications,
such
as
negative(zero)
thermal
expansion
(NTE/ZTE),
giant
magnetoresistance, nearly zero temperature coefficient of resistivity,
magnetostriction, magntocloric effect and so on. With increasing temperature,
the compound occasionally show sharp lattice contraction when there is a
magnetic transition. The sharp lattice contraction could be broadened after the
introduction of particular “relaxant”. This provides possibility to create the
suitable negative or nearly zero thermal expansion in the different temperature
ranges for practical applications.
In this presentation, we show the NTE/ZTE behaviors and nearly zero
temperature coefficient of resistivity in Mn3XN compounds, which can be
tunable and modified over a wide temperature range by some elemental
doping, substitution or introduction of vacancies in antiperovskite Mn3XN
compounds. In addition to NTE effect around magnetic transition, we will also
show that Mn3XN compounds with “Г5g” AFM magnetic structure, which have
nearly zero thermal expansion properties in the whole Г5g AFM temperature
region, such as Mn3Zn0.93N and Mn3GaN. The origin of abnormal thermal
expansion properties of Mn3XN compounds is discussed based on the strong
“spin-lattice” coupling supported by the neutron diffraction results.
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