Mechanism of ferromagnetic ordering of the Mn chains in CaMnGe${}_2$O${}_6$ clinopyroxene

Abstract

The electronic and magnetic properties of clinopyroxene CaMnGe${}_2$O${}_6$ were studied using density function calculations within the GGA+U approximation. It is shown that anomalous ferromagnetic ordering of neighboring chains is due to a "common-enemy" mechanism. Two antiferromagnetic exchange couplings between nearest neighbours within the Mn-Mn chain and interchain coupling via two GeO${}_4$ tetrahedra suppress antiferromagnetic exchange via single GeO${}_4$ tetrahedron and stabilize ferromagnetic ordering of Mn chains.

arXiv comment5 pages, 4 figures. Accepted to JETP Letters

References in corpus (7)

• The ALPS project release 1.3: open source software for strongly correlated systems
• Orbital physics in transition metal compounds: new trends
• Electronic structure and magnetic properties of pyroxenes (Li,Na)TM(Si,Ge)2O6: novel low-dimensional magnets with 90 bonds
• Jahn-Teller distortions and charge, orbital and magnetic orders in NaMn7O12
• Magnetic pyroxenes LiCrGe2O6 and LiCrSi2O6: dimensionality crossover in a non-frustrated S=3/2 Heisenberg model
• Orbital-Peierls State in NaTiSi2O6
• Unravelling the complex magnetic structure of multiferroic pyroxene NaFeGe2O6: A combined experimental and theoretical study

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