Magnetic resonance properties of the low-dimensional antiferromagnet Mn[C10H6(OH)(COO−)]2∙2H2O

Magnetic resonance studies of the metalorganic antiferromagnet Mn[C10H6(OH)(COO−)]2∙2H2O are carried out over a wide range of frequencies (25–12GHz) and temperatures (1.8–300K). The data on the temperature dependence of the magnetic susceptibility attest to a low-dimensional magnetic structure of this crystal. The results of resonance studies at a temperature of 1.8K are used to construct the frequency–field diagram of the antiferromagnetic resonance spectrum of this compound; it is described by the model of a biaxial rhombic antiferromagnet with the following parameters: ν01=14.1±0.1GHz, ν02=44.2±0.1GHz, Ha1=0.25kOe, Ha2=2.53kOe, Hsf=5.1±0.1kOe, 2He=98±1kOe. Two-magnon and nonresonance three-magnon absorption is observed, and the weakest interchain exchange interaction is estimated as J′=6.2×10−3K.