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) (.) 2H(2)O are carried out over a wide range of frequencies (25-12 GHz) and temperatures (1.8-300 K). 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 1.8 K 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: v(01) = 14.1 +/- 0.1 GHz, v(02) = 44.2 +/- 0.1 GHz, H-a1 = 0.25 kOe, H-a2 = 2.53 kOe, H-sf = 5.1 +/- 0.1 kOe, 2H(e) = 98 +/- 1 kOe. Two-magnon and nonresonance three-magnon absorption is observed, and the weakest interchain exchange interaction is estimated as J' = 6.2 x 10(-3) K. (c) 2006 American Institute of Physics.