Magnetic properties of a GdCr3(BO3)4 single crystal

The temperature dependence of the magnetic susceptibility χ (T) of the GdCr3(BO3)4 single crystal was studied in the temperature range of 2–300 K for two orientations of the external magnetic field: H ǁ c and H ± c. It was established that gadolinium chromium borate is ordered antiferromagnetically at TN = 7 K. It was found that, at T > 10 K, the magnetic properties of the crystal are isotropic, which is characteristic of the pure spin states of Cr3+ and Gd3+ ions. It was demonstrated that the magnetic susceptibility χ(T) of the GdCr3(BO3)4 compound at T > TN is well described by a one-dimensional spin model for a system of ferromagnetic chains of Cr3+ ions with ferromagnetic exchange 2J/k = −13.6 K and antiferromagnetic interchain interaction of 2J′/k = + 0.72 K. The gadolinium subsystem is antiferromagnetically biased due to the exchange f-d-interaction, which gives θGd=−2.8K. It was assumed that the GdCr3(BO3)4 compound is an antiferromagnet with “easy-plane” type anisotropy in the magnetically ordered state.

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