Year: 1997
Type: article
Abstract: We have studied the phase diagram and excitations of the spin-orbital model derived for a three-dimensional perovskite lattice, as in ${\mathrm{KCuF}}_{3}$. The results demonstrate that the orbital degeneracy drastically increases quantum fluctuations and suppresses the classical long-range order near the multicritical point in the mean-field phase diagram. This indicates the presence of a quantum liquid state, and we present explicit evidence for valence bond type correlations in three dimensions.
Source: Physical Review Letters
Institutions: Philips (Netherlands), Max Planck Society, Leiden University
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2014077889