Abstract
The changes in the magnetizations of Ni50Mn36Sn14 Heusler alloy (L21-NiMnSn-HA) with an antiferromagnetic interfacial exchange coupling have been investigated by using the effective field theory as a function of temperature and external magnetic field. It is shown that the Ni component is antiferromagnetic and its other components are ferromagnetic while the L21-NiMnSn-HA has a ferrimagnetic ordering below TC. And, they are paramagnetic above TC. The L21-NiMnSn-HA and its Ni component have the triple hysteresis loops below T* and the other components have only single hysteresis loop below TC. It is found that they exhibit type II/1 superconductivity at higher external magnetic field below T* and type II/2 superconductivity at lower external magnetic field above T*. Moreover, it is suggested that the surface superconductivity emerges below the conversion temperature of T∗≈ 0.74 and can be associated with the triple hysteresis loops which occur in the systems with an antiferromagnetic interfacial exchange coupling. And, the vortex state terminates at TV ≈ 4.37 for the Ni component of the L21-NiMnSn-HA. The HC-T phase diagrams of the L21-NiMnSn-HA and its Ni component are in qualitatively good agreement with the experimental and theoretical findings.
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