Theory of the Giant Magnetostriction in Fe_2TiO_4

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概要

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• The anomalous properties of Fe_2TiO_4, i. e. (i) the giant magnetostriction ((c-a)/a=7.5×10^<-3> at 77K), (ii) the anomalously small elastic constant (c_<11>-c_<12>), and (iii) the positive magnetic anisotropy, are explained by taking into account both the Jahn-Teller effect of Fe^<2+> ions in the A-sites of the spinel structure and the spin-lattice coupling of Fe^<2+> ions in the B-sites. It is shown that when the direction of the Jahn-Teller distortion is determined so as to lower the energy of the coupling between the spins in the B-sites and local distortions due to the Jahn-Teller effect, the Jahn-Teller distortion itself behaves as if it were a giant magneto-striction. The temperature dependences of the distortion, elastic constants and the specific heat are calculated. It is found that (c_<11>-c_<12>) has a minimum and the excess specific heat due to the Jahn-Teller ions has a maximum below the Neel temperature. Discussions on the magnetic anisotropy constant are also given.

• 社団法人日本物理学会の論文
• 1974-02-15

著者

• Kataoka Mitsuo

  The Research Institute For Iron Steel And Other Metals

• Kataoka Mitsuo

  The Research Institute For Iron Steel And Other Metls Tohoku University

関連論文

• Antisymmertric Spin Interaction in Metals
• Non-Phononic Mechanism of the Superconductivity in A15 Compounds
• Concentration Modulation and Stability of Long Period Superlattice in the Off-Stoichiometric Cu-Au Alloys
• Spin Waves in Systems with Long Period Helical Spin Density Waves Due to the Antisymmetric and Symmetric Exchange Interactions
• Critical Diffuse Scattering Due to the Cooperative Jahn-Teller Phase Transition
• Helical Spin Density Wave Due to Antisymmetric Exchange Interaction
• Theory of the Giant Magnetostriction in Fe_2TiO_4

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