Distinction between Lattice and Cluster Models of the Jahn-Teller Effect in an Orbital Doublet

M. Abou-Ghantous; P. C. Jaussaud; C. A. Bates; J. R. Fletcher; W. S. Moore

doi:10.1103/PhysRevLett.33.530

Distinction between Lattice and Cluster Models of the Jahn-Teller Effect in an Orbital Doublet

M. Abou-Ghantous, P. C. Jaussaud, C. A. Bates, J. R. Fletcher, and W. S. Moore

Phys. Rev. Lett. 33, 530 – Published 26 August 1974

Abstract

Acoustic-paramagnetic-resonance and electric-field-induced thermally detected EPR measurements have been made in crystals of ${Al}_{2}$ $O_{3}$ : ${Ni}^{3 +}$ . To reconcile theory with experiment, dynamic Jahn-Teller effects must be present, and, in addition, $2 q - p$ is shown to be less than unity. This is the first reported example of an orbital doublet for which the multimode rather than the cluster model is needed.