Characteristic Temperatures of the Metamagnetostructural Phase Transition in Vanadium-Doped Ni–Mn–In Heusler Alloy

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The thermomagnetic characteristics of vanadium-alloyed Ni–Mn–In Heusler alloys are investigated in this work. With increasing vanadium concentration, the characteristic temperatures of the metamagnetostructural phase transition shift towards the low-temperature region. The critical magnetic field required to induce a complete metamagnetostructural phase transition, calculated based on the temperature hysteresis and on the temperature range of transition existence, exhibits a significant discrepancy. The temperature dependences of the change in magnetization and the latent heat of the phase transition are constructed using the Clausius–Clapeyron equation. A comparison is provided for the derivatives of magnetization with respect to entropy and of the characteristic temperature with respect to the magnetic field, which are terms of the equation. The magnetocaloric effect was measured by a direct method in magnetic fields up to 1.8 T.