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VOLUME 110 (2019) | ISSUE 9 | PAGE 595
Mechanism of ferromagnetic ordering of the Mn chains in CaMnGe2O6 clinopyroxene
DOI: 10.1134/S0370274X19210045
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.