Determination of nuclear superstructure and magnetic structure in magnetocaloric Mn1-xNixAs
Magnetocaloric (MC) materials exhibit reversible temperature change upon the application or removal of a magnetic field. MC effects occur across magnetostructural spin-reorientation transitions. MC phenomenon can be exploited for room-temperature refrigeration by using materials having giant MC effect. In this context, rare-earth free MnAs system have shown promising results on refrigeration for room temperature application. Mn(1-x)Ni(x)As undergoes a magnetic phase transition along with structural phase transition accompanied by superstructure formation. The Proposal aims to determine both nuclear and magnetic superstructure Mn(1-x)Ni(x)As by variable temperature neutron powder diffraction. We will carry out variable temperature neutron powder diffraction experiments on 7 samples (NiAs MnAs and Mn1-xNixAs (t= 0.2, 0.25, 0.33, 0.4, 0.5)). Our main goal is to unravel the nature of order-disorder phase transition by establishing a nuclear superstructure and a magnetic structure in these MC materials.
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Dipankar Saha; FJELLVAG Helmer; FJELLVAG Oystein Slagtern; Gonano; KUMAR Susmit and PUENTE ORENCH Ines. (2019). Determination of nuclear superstructure and magnetic structure in magnetocaloric Mn1-xNixAs. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.DIR-172
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