ESR spectrum of KTm(MoO4)2

The angular and frequency dependences of the ESR spectrum of single-crystal KTm(MoO4)2 are investigated at helium temperature. It is shown that this compound belongs to the class of highly anisotropic paramagnets. The g factors of the ground state (gx=0.3±0.2; gy=0.3±0.2; gz=13.9±0.1) and the angle of rotation of the local axes in the ac plane (θ=±(7.6±1)°) are determined for two Tm3+ paramagnetic centers.