Abstract
Neutron diffraction studies of a TlMnCl3 powder samples show that they are antiferromagnets of the G-type with Neel temperature TN = (113 ± 5) K. The transition to the weak ferromagnetic state is observed at Tc = (110.5 ± 0.05) K by magnetic measurements. The magnetic susceptibility and the weak ferromagnetic moment of TlMnCl3 single crystals are found to be isotropic below the Neel temperature which is explained by twinning of the crystal. The twinning is removed by stressing the crystal along the [110] direction during cooling. The investigation of untwinned crystals allows to determine that the antiferromagnetic vector L lies in the [110] and the weak ferromagnetic moment in the [001] direction. The temperature dependences of the magnetic susceptibility and the weak ferromagnetic moment are investigated. [Russian Text Ignored].
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