Orthorhombic crystalline field splitting on orbital and magnetic orders in KCuF$_3$

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dc.creatorChen, Dong-Meng
dc.creatorZou, Liang-Jian
dc.date2005-09-28
dc.date.accessioned2026-07-07T06:19:35Z
dc.date.available2026-07-07T06:19:35Z
dc.descriptionMagnetic and orbital structures in KCuF$_{3}$ are revisited by the cluster self-consistent field approach developed recently. We clearly showed that due to the inherent frustration, the ground state of the system with the superexchange and Jahn-Teller phonon-mediated orbital couplings is highly degenerate without broken symmetry; the orthorhombic crystalline field splitting arising from static Jahn-Teller distortion stabilizes the orbital ordering, about 42% in the $x^{2}-y^{2}$ orbit and 58% in the $3z^{2}-r^{2}$ orbit in sublattices. The magnetic moment of Cu is considerably reduced to 0.49$μ_{B}$, and the magnetic coupling strengths are highly anisotropic, J$_{c}$/J$_{ab}$ $\approx$ 26. These results are in agreement with the experiments, implying that as an orbital selector, the crystalline field plays an essential role in stabilizing the ground state of KCuF$_{3}$. The 1s-3d resonant X-ray scattering amplitudes in KCuF$_{3}$ with the {\it type-a} and {\it type-d} structures are also presented.
dc.description4 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0509715
dc.identifierhttp://arxiv.org/abs/cond-mat/0509715
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/95079
dc.subjectStrongly Correlated Electrons
dc.titleOrthorhombic crystalline field splitting on orbital and magnetic orders in KCuF$_3$
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