Simultaneous measurement of lattice and magnetic structure during the martensite-austenite phase transition in novel all-d-Heusler compound

With the current proposal, we aim to investigate variations in the magnetic exchange coupling and the hybridization during the phase transition in the all-d Heusler magnetocaloric compound NiCoMnTi with varying Co and Ti concentrations. We could show that slight adjustments of the compositions control the occurring magnetostructural phase transition in a combined experimental and theoretical study. With the current proposal, we intend to simultaneously perform XMCD and XRD measurements at the 3d-TM K edges – revealing changes off the magnetic moments and the lattice structures during the austenite-martensite phase transition within the newly established ULMAG setup. These results will be supported by ab-initio DFT calculations and will help tailor the magnetocaloric properties in this class of materials.