The solid solution Eu(Ga1-xAlx)4 was grown in single crystal form to reveal a rich variety of crystallographic, magnetic, and electronic properties that differ remarkably from the isostructural end compounds EuGa4 and EuAl4. This is surprising given the similar covalent radii and electronic configuration of Ga and Al. Here we report the onset of magnetic spin reorientations and metamagnetic transitions observed in compounds from x = 0 - 1 evidenced by magnetization and temperature-dependent specific heat measurements. A maximum TN ~ 20 K is reported for x = 0.49, which is explained by the concomitant contraction of the a lattice parameter in this composition. Interestingly, anomalies in temperature-dependent resistivity measurements consistent with charge density wave behavior is shown for x = 0.49 and 1 only. Density functional theory calculations were used to show the increased ionic character between the Ga-Al bonds in the x = 0.49 structure, and crystallographic origins of the charge density wave behavior including disorder and chemical pressure are proposed.

Interplay between charge density wave behavior and antiferromagnetic order in the intermetallic single crystal system Eu(Ga1-xAlx)4

256th National Meeting (2018)

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