Suppression of martensitic transformation in Fe50Mn23Ga27 by local symmetry breaking
Suppression of martensitic transformation in Fe50Mn23Ga27 by local symmetry breaking
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DOI：
10.1063/1.4921928
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发表时间：
2015-05
影响因子：
4
通讯作者：
T. Ma;Xiaolian Liu;M. Yan;Chen Wu;S. Ren;Huiying Li;Minxia Fang;Z. Qiu;X. Ren
中科院分区：
文献类型：
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作者：
T. Ma;Xiaolian Liu;M. Yan;Chen Wu;S. Ren;Huiying Li;Minxia Fang;Z. Qiu;X. Ren
缺陷诱导的局部对称破缺抑制了非铁磁铁弹材料的马氏体相变，从而导致了材料的特殊性质。因此，在一类重要的铁弹性材料中，即，铁磁形状记忆合金。在这封信中，它被发现，局部对称性破缺，包括tetraxMn23Ga27合金的纳米夹杂物和反相界（APBs），抑制马氏体相变的体心立方Fe50Mn23Ga27合金，但是，不影响磁有序。大的电阻率被保留到低温铁磁状态，表现得像半金属铁磁体。APB处较低的有序度和四方相纳米颗粒晶格膨胀产生的局部应力场阻碍了长程有序马氏体的形成。抑制马氏体相变后的半金属导电行为扩展了铁电区。
Defects-induced local symmetry breaking has led to unusual properties in nonferromagnetic ferroelastic materials upon suppressing their martensitic transformation. Thus, it is of interest to discover additional properties by local symmetry breaking in one important class of the ferroelastic materials, i.e., the ferromagnetic shape memory alloys. In this letter, it is found that local symmetry breaking including both tetragonal nano-inclusions and anti-phase boundaries (APBs), suppresses martensitic transformation of a body-centered-cubic Fe50Mn23Ga27 alloy, however, does not affect the magnetic ordering. Large electrical resistivity is retained to the low temperature ferromagnetic state, behaving like a half-metal ferromagnet. Lower ordering degree at APBs and local stress fields generated by the lattice expansion of tetragonal nanoparticles hinder the formation of long-range-ordered martensites. The half-metal-like conducting behavior upon suppressing martensitic transformation extends the regime of ferr...