Premartensitic transition driven by magnetoelastic interaction in bcc ferromagnetic Ni2MnGa
Premartensitic transition driven by magnetoelastic interaction in bcc ferromagnetic Ni2MnGa
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DOI：
10.1103/physrevlett.79.3926
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发表时间：
1997-11-17
影响因子：
8.6
通讯作者：
Manosa, L
中科院分区：
文献类型：
--
作者：
Planes, A;Obrado, E;Manosa, L
我们表明，磁化强度和短波长声子的振幅之间的磁弹性耦合，使存在一个一阶premartensitic从bce到一个微调阶段在Ni 2 MnGa。这种磁致弹性耦合已被实验证明，交流磁化率和超声波测量下施加的磁场。用高灵敏度量热计测得潜热约为9 J/mol。该值与所提出的模型预测的值非常一致。
We show that the magnetoelastic coupling between the magnetization and the amplitude of a short wavelength phonon enables the existence of a first order premartensitic transition from a bce to a micromodulated phase in Ni2MnGa. Such a magnetoelastic coupling has been experimentally evidenced by ac susceptibility and ultrasonic measurements under an applied magnetic field. A latent heat around 9 J/mol has been measured using a highly sensitive calorimeter. This value is in very good agreement with the value predicted by a proposed model.