Synthesis and Physical Properties Study of the Antiperovskite Mn3Cu1-xZnxN
|School||Harbin Institute of Technology|
|Keywords||antiperovskite tuning on the magnetization and eletrical transportproperties magnetoresistance swicth effect critical behavior microwave synthesis|
Although the structure of antiperovskite compounds is analogical to that of theperovskite oxide,its properties are little known due to the absence of research. Inrecent years, several novel phenomenon in anperovskite have been found, such asnegative thermal expansion （NTE）, piezomagnetism, magnetocaloric,magetoresistance and near-zero temperature coefficient of resistance （TCR）. Thisdissertation aims at the synthesis and investigation on the physical properties ofantiperovskite Mn3Cu1-xZnxN. It is expected to accumulate data and deepen theunderstanding of this material system and also be helpful to related material design.In addition, this dissertation also offers a new rout for rapidly synthesis of thismaterial.According to the experimental results, the magnetic and electrical transportproperty of Mn3Cu1-xZnxN can be tuned by changing the ratio of doping element. Asfor Mn3Cu0.1Zn0.9N, Cu doping induces ferrimagnetism and weakensantiferromagnetism, and a plateau-like feature can be seen in ρ（T） curve ofMn3Cu0.1Zn0.9N. In addition, in Mn3Cu0.5Zn0.5N we found the temperature assistantmagnetoresistance switch effect, which is correlated with its intrinsic magnetictransition （antiferromagntism–ferrimagnetism-paramagnetism）, according topreminary analysis, this effet may originate from the competition between magneticand lattice scattering. Studies on the other components in Mn3CuxZn1-xN show atransition from ferrimagnetism to antiferromagnetism can be induced by changingthe ratio between doping elements. The critical behavior at the paramagnetic （PM）to ferromagnetic （FM） transition in Mn3CuN is investigated. It is found that criticalbehavior in Mn3CuN is divided into two independent stages: i) ZI（T> Tc）,mean-field model is assumed to occupy a predominate position. ii) ZII（T <Tc）critical behavior can be seen as the competition between Heisenberg model andmean-field model. We explore microwave route to synthesis antiperovskite compounds,which has several advantages such as high efficiency, low cost and pure product comparedwith the traditional method.