Phonon damping effect during the premartensitic transformation in Heusler alloy Ni₂MnGa

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• 作者：Wan ; Jianfeng ; Lei ; Xiaolin ; Chen ; Shipu ; Xu (T.Y. Hsu) ; Zuyao
• 关键词：75.10.-b ; 75.10.Jm ; 63.20.-e ; 63.20.Ls ; 64.70.Kb ; Phonon damping effect ; Magnon-transverse acoustic phonon interaction ; Premartensitic transformation
• 刊名：Physics Letters A
• 出版年：2004
• 出版时间：June 28, 2004
• 年：2004
• 卷：327
• 期：2-3
• 页码：216-220
• 全文大小：215 K

文摘

An interaction model between two magnons and one transverse acoustic (TA) phonon has been established to investigate the phonon damping effect leading to the softening of TA phonon and elastic modulus during the premartensitic transformation (PT) in Heusler alloy Ni₂MnGa. This kind of damping is found to be of the temperature- and wavevector-dependence. It seems clear that the phonon damping rises relatively steeply at the wavevector corresponding to the observed phonon softening mode due to the magnon–phonon coupling, and will reach its maximum at the PT temperature.