Cooperative Jahn-Teller Phase Transition in the Nickel-Zinc-Chromite System
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概要
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Results of thermal expansion and sound velocity measurements are presented for the Nickel-Zinc-Chromite system (Ni_xZn<1-x>Cr_2O_4). It is found that for x>0.6 this system exhibits a cooperative Jahn-Teller phase transition which occurs at a temperature T_a higher than the magnetic phase transition at T_n. Both transitions at T_a and T_N are of first order. The temperature dependence of the soft mode c_<11>-C_<12> could only be measured for T>T_a. From its temperature dependence, we conclude that the electronic state of the Ni^<2+> ion couples predominantly to the macroscopic strains. A compariison between our sound velocity date and the Kataoka-Kanamori theory gives only fair agreement for T>T_a. It is found that the low temperature magnetic phase transition influences the cooperative J-T-transition considerably.
- 社団法人日本物理学会の論文
- 1972-09-05
著者
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Kino Yoshihiro
Department Of Life Sciences Graduate School Of Arts And Sciences The University Of Tokyo
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Kino Yoshihiro
Department Of Physics Rutgers University:matsushita Research Institute Tokyo Inc.
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Luthi B.
Department Of Physics Rutgers University
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MULLEN M.
Department of Physics, Rutgers University
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Mullen M.
Department Of Physics Rutgers University
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