科研之友
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摘要
Magnetic order in brannerite type MnV2O6 has been studied by magnetization measurements and low temperature powder neutron diffraction. A sharp transition to a three-dimensionally ordered antiferromagnetic state is observed at T-N=20 K. Neutron diffraction at 5 K shows the spin structure to have a (0 0 1/2) propagation vector with Mn2+ moments of 4.77(7) mu(B) ordered parallel to b. Observed ferromagnetic order within chains of edge-sharing MnO6 octahedra is consistent with a positive Weiss temperature of 5.8 K. The long range coherence of the magnetic order is limited, with a coherence length of 900 A resulting from dilution of the Mn sites by 3% V due to intrinsic antisite disorder. The magnetic behavior of MnV2O6 is markedly different to that of the analogue CuV2O6 in which spin chain correlations were reported.
- 出版日期2007-2
