The magnetic and structural transformations in the Heusler-based system ${\mathrm{Ni}}_{0.50}{\mathrm{Mn}}_{0.50-x}{\mathrm{In}}_x$ are studied in the composition range $0.05⩽x⩽0.25$. While the cubic phase is preserved in the range $0.165⩽x⩽0.25$, we find the presence of martensitic transformations in alloys with $x⩽0.16$. In a critical composition range $0.15⩽x⩽0.16$, the magnetic coupling in both austenitic and martensitic states is ferromagnetic. Magnetic field-induced structural transitions are also found in the $x=0.16$ alloy, whereby the structural transition temperature shifts by $42\mathrm{K}$ in a field of $50\mathrm{kOe}$.

• Received 30 May 2005

DOI:https://doi.org/10.1103/PhysRevB.73.174413