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VOLUME 110 (2019) | ISSUE 9 | PAGE 595
Mechanism of ferromagnetic ordering of the Mn chains in CaMnGe2O6 clinopyroxene
Abstract
The electronic and magnetic properties of clinopyroxene CaMnGe2O6 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 GeO4 tetrahedra suppress antiferromagnetic exchange via single GeO4 tetrahedron and stabilize ferromagnetic ordering of Mn chains.