Determination of the magnetic structure of manganese carbodiimide with diffraction experiments using polarized neutrons

作者：Krott Manuel^*; Houben Andreas; Mueller Paul; Schweika Werner; Dronskowski Richard

来源：Physical Review B, 2009, 80(2): 024117.

DOI：10.1103/PhysRevB.80.024117

• antiferromagnetic materials
• carbon compounds
• frustration
• magnetic moments
• magnetic structure
• manganese compounds
• Neel temperature
• neutron diffraction
• nitrogen compounds
• space groups

The magnetic structure of MnNCN, the nitrogen equivalent of MnO, and the first carbodiimide of a non-d(10) transition metal ever made, has been determined on the basis of spin-polarized neutron-diffraction data close to absolute zero temperature. The S=5/2 moments of the high-spin Mn(2+) ions lie within the ab hexagonal sheets and exhibit an antiferromagnetic ordering between the sheets along the c axis. Below the Neacuteel point (28 K), a temperature-dependent ordering pattern exists due to magnetic frustration inside the sheets, characterized by a varying angle between the moments. A comparison with other magnetic structures reveals that the compact NCN(2-) group is capable of mediating significant spin density needed to ensure relatively strong magnetic communication in view of a large Mn(2+)-Mn(2+) separation.

• 出版日期2009-7