An Interpretation of Martensitic Transformation in L1<SUB>2</SUB>-Type Fe<SUB>3</SUB>Pt from Its Electronic Structure

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  • Yamamoto Takuya
    Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University
  • Yamamoto Masataka
    Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University
  • Fukuda Takashi
    Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University
  • Kakeshita Tomoyuki
    Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University
  • Akai Hisazumi
    Department of Physics, Graduate School of Science, Osaka University

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  • An interpretation of martensitic transformation in L1[2]-type Fe3Pt from its electronic structure

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Partly ordered Fe3Pt is one of ferromagnetic shape memory alloys exhibiting a large magnetic field-induced strain in its martensite phase formed by a second-order-like martensitic transformation from the L12-type structure to the so-called FCT martensite (L60-type structure). We have investigated the origin of this transformation from their electronic structures calculated in the present study. A characteristic feature in the electronic structure is the existence of a relatively high peak in the density of states of the minority spin band just below the Fermi energy. This peak splits into two peaks by tetragonal distortion, and one of them shifts to lower energy by the distortion, suggesting that the band Jahn-Teller effect is the main cause for the transformation.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 51 (5), 896-898, 2010

    The Japan Institute of Metals and Materials

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