Mesoscopic phase transitions and critical behavior of complex magnetic shape-memory systems
Mesoscopic phase transitions and critical behavior of complex magnetic shape-memory systems
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复杂磁性形状记忆系统的介观相变和关键行为
DOI：
10.1103/physrevb.66.014411
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发表时间：
2002
影响因子：
3.7
通讯作者：
M. Matsumoto
中科院分区：
文献类型：
--
作者：
Y. Yamazaki;H. Gleiter;J. Tani;M. Matsumoto
有趣的复杂系统的磁性形状记忆功能，如Ni 2 + xMn 1 -xGa，被认为是铁磁和结构相变之间的合作现象。用平均场理论导出了这些合金单晶的介观相变和临界行为。利用重整化理论，考虑多晶晶界和多余Ni原子作为随机扩展缺陷的分布，讨论了多晶系统的一级和二级相变的临界行为以及三临界行为。从纳米结构系统的介观角度总结了它们的特性。
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.