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

Abstract

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

References in corpus (2)

• Magnetic properties of EuPtSi${}_3$ single crystals
• Effect of chemical substitution and pressure on YbRh2Si2

Cited by in corpus (18)

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• Giant magnetoresistance and topological Hall effect in the EuGa4 antiferromagnet
• Competing charge and magnetic order in the candidate centrosymmetric skyrmion host EuGa${}_2$Al${}_2$
• Ferromagnetic Quantum Critical Point in CePd${}_2$P${}_2$ with Pd $\to$ Ni Substitution
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• Field-Induced Magnetic States in the Metallic Rare-Earth Layered Triangular Antiferromagnet TbAuAl${}_4$Ge${}_2$
• Non-centrosymmetric, transverse structural modulation in SrAl4, and elucidation of its origin in the BaAl4 family of compounds
• Low-field magnetic anomalies in single crystals of the A-type square-lattice antiferromagnet EuGa${}_4$
• Resonant elastic X-ray scattering of antiferromagnetic superstructures in EuPtSi${}_3$
• Experimental progress in Eu(Al,Ga)${}_4$ topological antiferromagnets
• Origin of multiple skyrmion phases in EuAl4
• I-centered vs F-centered orthorhombic symmetry and negative thermal expansion of the charge density wave of EuAl2Ga2
• Correlation between Complex Spin Textures and the Magnetocaloric and Hall Effects in Eu(Ga${}_{1-x}$Al${}_x$)${}_4$ ($x$ = 0.9, 1)
• Electron-phonon coupling in EuAl4 under hydrostatic pressure
• Collinear spin density wave state in distorted square-lattice GdNiSn${}_4$