The magnetic susceptibility χ of single-crystal antiferromagnet FeG e 2 ( T N = 289 K) was measured in the temperature range from 4.2 to 300 K in a magnetic field H up to 40 kOe applied along the main crystallographic axes. For the antiferromagnetic (AFM) state at low temperatures, a strong increase in χ is observed with increasing H applied along the [100] axis, which reaches saturation at H H 0  11 kOe. It is assumed that this behavior is associated with a field-induced change in the AFM domain structure, and the single-domain state is realized in a field above H 0 with the AFM axis perpendicular to the field direction. The study of χ under the uniaxial P a and uniform P pressures in a wide temperature range has revealed an anomalously large increase in χ in AFM state with increasing uniaxial pressure for P a | | H | | [ 100 ] at H H 0. The observed growth of χ saturates at pressure P a P a 1.5 kbar and suggests the formation of the single-domain state for the above conditions. The values of uniform pressure effect on χ was found to lie in the range d ln χ / d P = − (2–3) Mbar–1, being weakly dependent on the magnetic state and field direction. In addition, the uniform pressure effect on the transition temperature between two AFM structures in FeG e 2, T M 263 K, was found to be weak.

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