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We present an extensive study of the structural, magnetic and thermodynamicproperties of high-quality monocrystals of the two heterometallic oxyboratesfrom the ludwigite family: Cu$_2$GaBO$_5$ and Cu$_2$AlBO$_5$ in the temperaturerange above 2 K. The distinctive feature of the investigated structures is theselective distribution of Cu and Ga/Al cations. The unit cell of Cu$_2$GaBO$_5$and Cu$_2$AlBO$_5$ contains four nonequivalent crystallographic sites of metalions. Two sites in the structure from four nonequivalent crystallographic sitesof metal ions of Cu$_2$GaBO$_5$ are fully occupied by Cu atoms which form thequasi one-dimensional chains along the a-axis. For Cu$_2$AlBO$_5$ all sites arepartially occupied by Al and Cu atoms. The joint analysis of low-temperaturedata on magnetic susceptibility and magnetic contribution to the specific heatshowed that Cu$_2$AlBO$_5$ and Cu$_2$GaBO$_5$ exhibit an antiferromagnetictransition at $T_{\rm N} \approx 3$ and 4 K, respectively. The magneticcontributions to the specific heat for both compounds were obtained aftersubtracting the phonon contribution. It is shown that the external magneticfield above 2.5 T leads to a broadening of the magnetic phase transitionindicating suppression of the long-range antiferromagnetic order.

Structure, magnetic and thermodynamic properties of heterometallic ludwigites: Cu2GaBO5 and Cu2AlBO5