Abstract
The structural and magnetic transition in Mn-deficient Co0.4Ni0.6Mn1−xGe was investigated by DC magnetization and temperature-dependent X-ray diffraction measurements. By introducing Mn vacancies in the stoichiometric Co0.4Ni0.6MnGe compound, multiple magnetic phase transitions and tunable martensitic transitions were observed. A paramagnetic martensite (Ni2In-type structure) to ferromagnetic austenite (TiNiSi-type structure) transition was realized in Co0.4Ni0.6Mn0.98Ge around 275 K. A large volume expansion of 2.6% accompanied this transition. In addition, a martensitic transition induced by the magnetic field was also observed near room temperature. Furthermore, a significant magnetic entropy variation of − 21.3 J/kg K at 263 K (∆B = 5 T) was obtained in the Co0.4Ni0.6Mn0.98Ge compound.
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