Cooperative Jahn-Teller Phase Transition in the Nickel-Zinc-Chromite System
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Results of thermal expansion and sound velocity measurements are presented for the Nickel-Zinc-Chromite system (Ni<I><SUB>x</SUB></I>Zn<SUB>1−<I>x</I></SUB>Cr<SUB>2</SUB>O<SUB>4</SUB>). It is found that for <I>x</I>>0.6 this system exhibits a cooperative Jahn-Teller phase transition which occurs at <I>a</I> temperature <I>T<SUB>a</SUB></I> higher than the magnetic phase transition at <I>T</I><SUB>N</SUB>. Both transitions at <I>T<SUB>a</SUB></I> and <I>T</I><SUB>N</SUB> are of first order. The temperature dependence of the soft mode <I>c</I><SUB>11</SUB>–<I>c</I><SUB>12</SUB> could only be measured for <I>T</I>><I>T<SUB>a</SUB></I>. From its temperature dependence, we conclude that the electronic state of the Ni<SUP>2+</SUP> ion couples predominantly to the macroscopic strains. A comparison between our sound velocity data and the Kataoka-Kanamori theory gives only fair agreement for <I>T</I>><I>T<SUB>a</SUB></I>. 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
社団法人 日本物理学会 | 論文
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