Martensitic transition assisted modification of the antiferromagnetic ordering 
in Ge-site doped MnNiGe alloys

Das, S. C.; Sannigrahi, J.; Dutta, P.; Pramanick, S.; Khalyavin, D.; Adroja, D. T.; Chatterjee, S.

doi:10.1103/PhysRevB.103.094422

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Martensitic transition assisted modification of the antiferromagnetic ordering in Ge-site doped MnNiGe alloys

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Sannigrahi, J.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Das, S. C., Sannigrahi, J., Dutta, P., Pramanick, S., Khalyavin, D., Adroja, D. T., et al. (2021). Martensitic transition assisted modification of the antiferromagnetic ordering in Ge-site doped MnNiGe alloys. Physical Review B, 103(9): 94422, pp. 1-8. doi:10.1103/PhysRevB.103.094422.

Cite as: https://hdl.handle.net/21.11116/0000-0008-3B30-0

Abstract

The magnetic equiatomic alloys of the nominal compositions MnNiGe0.9Al0.1 and MnNiGe0.928Ga0.072 have been investigated through the neutron powder diffraction (NPD) technique. Both these alloys undergo a martensitic phase transition from the high-temperature hexagonal (Ni2In type, with space group P63/mmc) austenite phase to the low-temperature orthorhombic (TiNiSi type, with space group Pnma) martensite phase. Our NPD analysis confirmed an incommensurate antiferromagnetic ordering of the low-temperature martensitic phase with helical modulation. The incommensurate propagation vector k is found to be (0.2065(1),0,0) and (0.2088(4),0,0) for Al and Ga doped alloys, respectively, at 1.5 K and shows a monotonic increase with increasing sample temperature. On the other hand, a commensurate antiferromagnetic ordering was observed for the high-temperature austenite phase. The incomplete martensitic transition allowed both these incommensurate and commensurate antiferromagnetic structures to coexist down to the lowest temperature of measurement (1.5 K). © 2021 American Physical Society.