Çaklr, ; Dias, E.; Priolkar, K.R.; Hoser, A.; Farle, M.; Acet, M.: Heterogeneous magnetism and kinetic arrest in antiperovskite Mn3-xNixGaC compounds with Ni2MnGa Heusler insertions. Physical Review B 102 (2020), p. 024431/1-8
10.1103/physrevb.102.024431
Abstract:
Mn-based antiperovskite compounds in the form Mn3𝐴𝑋, where 𝐴 is a main group element and 𝑋 is C or N, undergo magnetostructural transitions with which these materials acquire magnetocaloric, giant magnetoresistance, and spin-transport properties, which can be modified or tailored by manipulating the compositions of numerous compounds. This enables closer investigations and better understandings of the underlying principles governing these properties. Mn3−𝑥Ni𝑥GaC, which is a derivative of the prototype Mn3GaC antiperovskite, would normally be expected to form a cubic structure with a homogeneous composition. Contrary to this, we find that the addition of Ni leads to a heterogenous compound consisting of an antiperovskite part and a Ni2MnGa Heusler insertions. The system shows kinetic arrest features, which we study as a function of Ni composition using the techniques of x-ray diffraction, magnetization, and neutron diffraction under a magnetic field.