Magnetovolume effects in manganese nitrides with antiperovskite structure.
Magnetovolume effects in manganese nitrides with antiperovskite structure.
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DOI：
10.1088/1468-6996/15/1/015009
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发表时间：
2014-02
影响因子：
5.5
通讯作者：
Asano K
中科院分区：
文献类型：
--
作者：
Takenaka K;Ichigo M;Hamada T;Ozawa A;Shibayama T;Inagaki T;Asano K
系统地研究了反钙钛矿型氮化锰的化学计量学和固溶体Mn3Cu1−xAxN （A = Co, Ni, Zn, Ga, Ge, Rh, Pd, Ag, in， Sn或Sb）的磁结构相关性。这类氮化物因其巨大的负热膨胀而备受关注，这是通过在A位掺杂Ge或Sn作为加热时急剧体积收缩（自发体积磁致伸缩ωs）的松弛剂而实现的。大ωs的物理背景和体积随温度逐渐收缩的机理是这些氮化物的物理和应用研究的中心问题。一个完整的热膨胀、晶体结构和磁化数据表明，立方三角形反铁磁态对于大ωs是至关重要的。从Mn6N八面体的几何挫折和磁应力的概念出发，讨论了ωs与磁性结构之间的密切关系。本文的结果还表明，ωs取决于A原子中d电子的数目，这表明了A原子的d轨道的重要作用。并不是所有的A位掺杂剂，而是干扰立方三角形反铁磁态的元素，都能有效地扩大体积变化。这一事实表明，相边界附近的不稳定性与展宽有关。近年来的微探针研究表明，体积逐渐变化与局部构造异常之间存在一定的关系。
Magnetostructural correlations in antiperovskite manganese nitrides were investigated systematically for stoichiometric and solid solution Mn3Cu1−xAxN (A = Co, Ni, Zn, Ga, Ge, Rh, Pd, Ag, In, Sn or Sb). This class of nitrides is attracting great attention because of their giant negative thermal expansion, which is achieved by doping Ge or Sn into the A site as a relaxant of the sharp volume contraction on heating (spontaneous volume magnetostriction ωs) because of the magnetovolume effects. The physical background of large ωs and mechanism of how the volume contraction becomes gradual with temperature are central concerns for the physics and applications of these nitrides. An entire dataset of thermal expansion, crystal structure and magnetization demonstrates that the cubic triangular antiferromagnetic state is crucial for large ωs. The intimate relationship between ωs and the magnetic structure is discussed in terms of geometrical frustration related to the Mn6N octahedron and magnetic stress concept. The results presented herein also show that ωs depends on the number of d electrons in the A atom, suggesting the important role of the d orbitals of the A atom. Not all the dopants in the A site, but the elements that disturb the cubic triangular antiferromagnetic state, are effective in broadening the volume change. This fact suggests that instability neighboring the phase boundary is related to the broadening. The relation between the gradual volume change and the local structure anomaly is suggested by recent microprobe studies.
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影响因子：
4
作者：
Chatterji, Tapan;Zbiri, Mohamed;Hansen, Thomas C.
通讯作者：
Hansen, Thomas C.
影响因子：
4
作者：
Asano, K.;Koyama, K.;Takenaka, K.
通讯作者：
Takenaka, K.
影响因子：
1.7
作者：
FRUCHART, D;BERTAUT, EF
通讯作者：
BERTAUT, EF
DOI：
10.1051/jphyslet:0197700380102100
发表时间：
1977-01-01
期刊：
JOURNAL DE PHYSIQUE LETTRES
影响因子：
--
作者：
FRUCHART, D;BERTAUT, EF;FRUCHART, R
通讯作者：
FRUCHART, R
影响因子：
4.4
作者：
Kimura, Yoshisato;Sakai, Kiichi;Mishima, Yoshinao
通讯作者：
Mishima, Yoshinao