Cobalt-Based Pyroxenes: A New Playground for Kitaev Physics and Ising Model Realization
arxiv(2024)
摘要
Recent advances in the study of cobaltites have unveiled their potential as a
promising platform for realizing Kitaev physics in honeycomb systems and the
Ising model in weakly coupled chain materials. In this manuscript, we explore
the magnetic properties of pyroxene SrCoGe_2O_6 using a combination of
neutron scattering, ab initio methods, and linear spin-wave theory.
Through careful examination of inelastic neutron scattering powder spectra, we
propose a modified Kitaev model to accurately describe the twisted chains of
edge-sharing octahedra surrounding Co^2+ ions. The extended
Kitaev-Heisenberg model, including a significant anisotropic bond-dependent
exchange term with K/|J|=0.96, is identified as the key descriptor of the
magnetic interactions in SrCoGe_2O_6. Furthermore, our heat capacity
measurements reveal an effect of an external magnetic field (approximately
13 T) which shifts the system from a fragile antiferromagnetic ordering with
T_N=9 K to a field-induced state. We argue that pyroxenes,
particularly those modified by substituting Ge with Si and its less extended
p orbitals, emerge as a novel platform for the Kitaev model. This opens up
possibilities for advancing our understanding of Kitaev physics.
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