Theory of Multiple Spin Density Wave and Lattice Distortion in fcc Antiferromagnets
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概要
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The phase diagram of the Mn1-xAx ($\text{A}=\text{Ni}$, Ga, Rh, and Au) alloys, which are known as the first-kind antiferromagnets, is explained theoretically. Our Hamiltonian is composed of the polynomial of the variables describing multiple spin density wave (MSDW) states, the coupling between the variables and the symmetry strain and the elastic energy. The polynomial is derived from symmetry consideration. By calculating the partition function and the free energy, we show that the phase diagram is reproduced and elucidate the structure of the MSDW at each phase and the condition of the appearance of the orthorhombic phase.
- 2009-12-15
著者
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Jo Takeo
Department Of Materials Science Faculty Of Science Hiroshima University
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Jo Takeo
Department of Quantum Matter, ADSM, Hiroshima University, Higashihiroshima, Hiroshima 739-8530
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Matsuura Yasuyuki
Department of Quantum Matter, ADSM, Hiroshima University, Higashihiroshima, Hiroshima 739-8530
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