Coexistence of ferromagnetism and superconductivity in NiBi-binary alloy |
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| Affiliation: | 1. Department of Basic Sciences, University of Informational Science and Technology of Beijing, Beijing 100101, PR China;2. School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, PR China;3. Institute of Condensed Matter Physics, Inner Mongolia University for Nationalities, Tongliao 028043, PR China |
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| Abstract: | We investigate the effects of the antiferromagnetic exchange coupling between the Nickel and Bismuth2 atoms (Jint2 < 0) on the magnetizations of the NiBi-binary alloy versus temperature and external magnetic field by means of the effective field theory. We find that the magnetization of the Ni, Bi1, Bi2 and total NiBi-binary alloy has two different magnetic phase transitions for the Jint2 < 0. One of them is a first-order phase transition (FOPT) at Tt = 0.349 and the other is a second-order phase transition (SOPT) at Tc = 0.791. We also study the hysteresis behaviors and we find that the values of the coercive field points of the Bi2 are higher than those of the Ni and Bi1. Moreover, Ni, Bi1 and Bi2 components have ferromagnetic hysteresis behaviors whereas the total NiBi has type II superconducting behavior. Therefore, we suggest that ferromagnetism and superconductivity coexist in the NiBi-binary alloy that is qualitatively good agreement with the some experimental and theoretical works. |
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