| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Spontaneous Magnetization and Magnon-TA Phonon Interaction during the Premartensitic Transformation in Ni2 MnGa Alloy |
| WAN Jian-Feng** |
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240
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| Cite this article: |
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WAN Jian-Feng 2012 Chin. Phys. Lett. 29 106301 |
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Abstract The magnetic anomaly associated with the premartensitic transformation (PT) in Heusler alloy Ni2MnGa is investigated by using the Green's function technique based on the magnon-TA phonon interaction. The results of the numerical calculations suggest that the magnetic anomaly during the PT may originate from the strong magnon-TA phonon interaction, because this kind of coupling effect will destroy the magnetic ordering in some local zones and reduce the magnetization of the system. Magnon-magnon interaction plays a positive role in enhancing the magnetization and tends to reduce the PT temperature while this kind of interaction has little effect on the characteristic TA phonon-wavevector corresponding to the anomaly of spontaneous magnetization at the PT temperature.
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Received: 16 March 2012
Published: 01 October 2012
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| PACS: |
63.20.kk
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(Phonon interactions with other quasiparticles)
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75.60.Ej
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(Magnetization curves, hysteresis, Barkhausen and related effects)
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64.70.K-
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75.10.Dg
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(Crystal-field theory and spin Hamiltonians)
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