Abstract
AbstractStimulated by ESR measurements in SmB6:Er3+ the unusual g‐factor behaviour of the Er3+ ground state, which is extraordinarily isotropic, is ascribed to a new kind of Jahn‐Teller‐type phenomenon. The 4f–5d hybridization deformations of the Sm neighbourhood adopt the role which in conventional Jahn‐Teller systems is played by nuclear distortions. Arguments for this proposition and numerical results are given. These show that the “minimal” model constitutes a good starting point for refined theories. Several options of refinement are indicated.
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