Lattice instability in ZnSe:Ni crystal |
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| Authors: | V V Gudkov A T Lonchakov A V Tkach I V Zhevstovskikh V I Sokolov N B Gruzdev |
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| Institution: | (1) Institute for Metal Physics of the Russian Academy of Sciences, 620219 Yekaterinburg, Russia;(2) Russian State Vocational Pedagogical University, 620012 Yekaterinburg, Russia |
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| Abstract: | Ultrasonic experiments, done on ZnSe:Ni crystal with the dopant concentration 5.5×1019 cm−3, revealed precursor phenomenon in the form of lattice softening at temperatures significantly exceeding the temperature of
structural transition (Tc=14.5 K). It proved to be that the order parameter of the transition was associated with the shear deformation ε4. Investigation of thermal conductivity (κ) in the same temperature region pointed out that the Jahn-Teller (JT) effect could
be responsible for the anomalous behavior of κ(T) and lattice instability. |
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| Keywords: | ZnSe:Ni lattice instability Jahn-Teller effect |
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