Surface Superconductivity in Ni{sub 50}Mn{sub 36}Sn{sub 14} Heusler Alloy
- Dumlupınar University, Department of Electronics and Automation, Kutahya Vocational School of Technical Sciences (Turkey)
The changes in the magnetizations of Ni{sub 50}Mn{sub 36}Sn{sub 14} Heusler alloy (L{sub 21}-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 L{sub 21}-NiMnSn-HA has a ferrimagnetic ordering below T{sub C}. And, they are paramagnetic above T{sub C}. The L{sub 21}-NiMnSn-HA and its Ni component have the triple hysteresis loops below T* and the other components have only single hysteresis loop below T{sub C}. 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{sup ∗}≈ 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 T{sub V} ≈ 4.37 for the Ni component of the L{sub 21}-NiMnSn-HA. The H{sub C}-T phase diagrams of the L{sub 21}-NiMnSn-HA and its Ni component are in qualitatively good agreement with the experimental and theoretical findings.
- OSTI ID:
- 22773594
- Journal Information:
- Journal of Superconductivity and Novel Magnetism, Vol. 31, Issue 12; Other Information: Copyright (c) 2018 Springer Science+Business Media, LLC, part of Springer Nature; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA); ISSN 1557-1939
- Country of Publication:
- United States
- Language:
- English
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