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Effect of chemical and hydrostatic pressure on the coupled magnetostructural transition of Ni-Mn-In Heusler alloys

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Devi,  P.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Singh,  Sanjay
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Nicklas,  M.
Michael Nicklas, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser,  C.
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Devi, P., Salazar Mejía, C., Caron, L., Singh, S., Nicklas, M., & Felser, C. (2019). Effect of chemical and hydrostatic pressure on the coupled magnetostructural transition of Ni-Mn-In Heusler alloys. Physical Review Materials, 3(12): 122401, pp. 1-7. doi:10.1103/PhysRevMaterials.3.122401.


Cite as: http://hdl.handle.net/21.11116/0000-0005-69A0-0
Abstract
Ni-Mn-In magnetic shape-memory Heusler alloys exhibit generally a large thermal hysteresis at their first-order martensitic phase transition which hinders a technological application in magnetic refrigeration. By optimizing the Cu content in Ni2CuxMn1.4-xIn0.6, we obtained a thermal hysteresis of the martensitic phase transition in Ni2Cu0.2Mn1.2In0.6 of only 6 K. We can explain this very small hysteresis by an almost perfect habit plane at the interface of martensite and austenite phases. Application of hydrostatic pressure does not reduce the hysteresis further, but shifts the martensitic transition close to room temperature. The isothermal entropy change does not depend on warming or cooling protocols and is pressure independent. Experiments in pulsed-magnetic fields on Ni2Cu0.2Mn1.2In0.6 find a reversible magnetocaloric effect with a maximum adiabatic temperature change of -13 K.