Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
1997-03-24
Physics
Condensed Matter
Disordered Systems and Neural Networks
19 pages, Latex, submitted to J. of Phys., some small supplements
Scientific paper
10.1088/0953-8984/9/41/004
Substitutional defects in a cubic symmetry (such as a lithium defect in a KCl host crystal) can be modeled appropriately by an eight-state-system. Usually this tunneling degree of freedom is approximated by a two-level-system. We investigate the observable differences between the two models in three contexts. First we show that the two models predict different relations between the temperature dependence of specific heat and static susceptibility. Second we demonstrate that in the presence of external forces (pressure and electric field) the eight-state-system shows features that cannot be understood within the framework of the two-level-approximation. In this context we propose an experiment for measuring the parameter for tunneling along the face diagonal. Finally we discuss the differences between the models appearing for strongly coupled pairs. Geometric selection rules and particular forms of asymmetry lead to clear differences between the two models.
Nalbach Peter
Terzidis Orestis
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