Abstract
The successive phase transitions in K 2PbCu(NO 2) 6 has been studied by precise X-ray measurements. The unit cell in Phase III is doubled along each of the cubic principal axes. The experimental results can be interpreted as sequencial cooperative Jahn-Teller transitions where the higher transition is due to the coupling with the uniform distortion, while the lower transition is caused by the coupling with the uniform distortion, while the lower transition is caused by the coupling with the zone boundary phonon mode with k 0 = ( 1 2 , 1 2 , 1 2 . The electronic state in Phase III is characterized as the “canted pseudospin” state.
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