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- W2079485428 abstract "Structural transformation of CoAs and NiAs from NiAs-type to MnP-type are studied microscopically. Electron-lattice matrix elements and generalized susceptibilities are calculated on the basis of electronic bands obtained by APW method. Band calculation of FeAs having MnP-type structure is made for non-magnetic state. Results are discussed in connection with magnetic ordering. Magnetic properties of NiAs-type transition metal compounds, such as MnAs, MnSb, and CoAs, were in- vestigated from the view-point of itinerant electrons by taking account of spin fluctuations (I). Some of these compounds reveal a structural phase transition from the NiAs-type to MnP-type as temperature decreases. A crucial question is why this kind of structural trans- formation occurs in MnAs, CrAs, and CoAs, but not in MnSb, CrSb, and NiAs: We have studied microscopically an instability of the NiAs-type structure on the basis of the electronic band structure, by taking into account the effect of the wave- number and mode dependences of the electron-lattice interaction as well as the nesting of the Fermi surface. Results for Mn- and Cr-compounds were reported in reference (2). In the present paper lattice instabilities of CoAs and NiAs are mainly studied. A change of the electronic free energy due to a lattice distortion characterized by a particular phonon normal coordinate Qqx (q : the wave vector, X : the mode) is expressed as" @default.
- W2079485428 created "2016-06-24" @default.
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- W2079485428 date "1988-12-01" @default.
- W2079485428 modified "2023-09-27" @default.
- W2079485428 title "STRUCTURAL PHASE TRANSITION AND MAGNETISM OF Ni-As-TYPE TRANSITION METAL PNICTIDES" @default.
- W2079485428 doi "https://doi.org/10.1051/jphyscol:1988881" @default.
- W2079485428 hasPublicationYear "1988" @default.
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