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The solid solution Eu(Ga_1-xAl_x)_4 was grown in single crystal form toreveal a rich variety of crystallographic, magnetic, and electronic propertiesthat differ from the isostructural end compounds EuGa_4 and EuAl_4, despite thesimilar covalent radii and electronic configurations of Ga and Al. Here wereport the onset of magnetic spin reorientation and metamagnetic transitionsfor x = 0 - 1 evidenced by magnetization and temperature-dependent specificheat measurements. T_N changes non-monotonously with x, and it reaches amaximum around 20 K for x = 0.50, where the a lattice parameter also shows anextreme (minimum) value. Anomalies in the temperature-dependent resistivityconsistent with charge density wave behavior exist for x = 0.50 and 1 only.Density functional theory calculations show increased polarization between theGa-Al covalent bonds in the x = 0.50 structure compared to the end compounds,such that crystallographic order and chemical pressure are proposed as thecauses of the charge density wave behavior.

Charge density wave behavior and order-disorder in the antiferromagnetic metallic series Eu(Ga_1-xAl_x)_4