Электронный каталог

Статья

Maksimov, P.A.
Cobalt-Based Pyroxenes: A New Playground for Kitaev Physics / P.A.Maksimov, A.V.Ushakov, A.F.Gubkin, [a.o.] // PNAS : The Proceedings of the National Academy of Sciences of the United States of America [Electronic resource]. – 2024. – Vol. 121, No. 43. – P. e2409154121. – URL: https://doi.org/10.1073/pnas.2409154121.

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&sub(2)O&sub(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&sub(2)O&sub(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&sub(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 platform for the Kitaev model. This opens up possibilities for advancing our understanding of Kitaev physics.



ОИЯИ = ОИЯИ (JINR)2024
Спец.(статьи,препринты) = С 326.3 - Ферми-системы. Спиновые системы
Спец.(статьи,препринты) = С 342 г1 - Замедление и диффузия нейтронов. Дифракция
Бюллетени = 3/025