Ising spin ladders of orthopyroxene CoGeO₃

2025/08/05 by Maksimov, Pavel A., Gubkin, Andrey F., Ushakov, Alexey V. +6
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el)

paper · doi:10.48550/arxiv.2508.03664

Abstract

We present thermodynamic and spectroscopic measurements for an orthopyroxene CoGeO₃ with magnetic Co²⁺ ions that form quasi-one-dimensional ladders. We show that non-collinear magnetic order below T_N=32 K can be stabilized by a strong local easy-axis anisotropy of j_eff=1/2 moments, which is induced by ligand octahedra distortions. Extraction of a magnetic Hamiltonian from inelastic neutron scattering measurements supports this interpretation and allows us to establish an effective magnetic model. The resulting exchange Hamiltonian justifies CoGeO₃ as a realization of an Ising spin ladder compound.

Citations

• Braided Ising spin-tube physics in a purported kagome magnet
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• Wannier90 as a community code: new features and applications
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