Abstract
The angular and frequency dependence of the linewidth of the EPR absorption spectrum of the metalorganic antiferromagnet Mn[C10H6(OH)(COO−)]2×2H2O are investigated at high temperature (T=250K). The behavior of the EPR spectrum at high temperatures is described by a diffusion model for quasi-two-dimensional magnetic structures. Estimates are made for the diffusion coefficient D, the times of the beginning τ1 and end τ2 of the diffusion regime, and the nondiffusive contribution to the EPR linewidth. The temperature dependence and field dependence of the magnetic susceptibility and magnetization in the temperature region 1.8–25K in pulsed magnetic field up to 150kOe along the principal magnetic axes. A weak ferromagnet moment along the easy axis of the antiferromagnet and the spin-reorientation magnetic phase transitions at H1=5kOe (spin-flop transition) and H2≈97±2kOe and H3≈100±2kOe (spin-flip transitions) for the easy and medium axes of magnetization.
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