Abstract
Interesting complex systems with magnetic shape-memory functions, like Ni 2 + x Mn 1 - x Ga, are considered, which appear as cooperative phenomena between ferromagnetic and structural phase transitions. Mesoscopic phase transitions and critical behavior in single crystals of these alloys are derived by mean-field theory. By renormalization theories, taking into account the distributions of polycrystalline boundaries and excess Ni atoms as randomly extended defects, we discuss the critical behavior of the first- and the second-order phase transitions and the tricritical behavior of the polycrystalline systems. Their characteristics are concluded from a mesoscopic point of view of nanostructured systems.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
