First-principles study of phase stability of Gd-doped EuO and EuS

Abstract

Phase diagrams of isoelectronic Eu${}_{1-x}$Gd${}_x$O and Eu${}_{1-x}$Gd${}_x$S quasi-binary alloy systems are constructed using first-principles calculations combined with the standard cluster expansion approach and Monte-Carlo simulations. The oxide system has a wide miscibility gap on the Gd-rich side but forms ordered compounds on the Eu-rich side, exhibiting a deep asymmetric convex hull in the formation enthalpy diagram. The sulfide system has no stable compounds. The large difference in the formation enthalpies of the oxide and sulfide compounds is due to the contribution of local lattice relaxation, which is sensitive to the anion size. The solubility of Gd in both EuO and EuS is in the range of 10-20% at room temperature and quickly increases at higher temperatures, indicating that highly doped disordered solid solutions can be produced without the precipitation of secondary phases. We also predict that rocksalt GdO can be stabilized under appropriate experimental conditions.

arXiv comment14 pages, 6 figures (some with multiple panels), revtex4 with embedded eps

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Cited by in corpus (8)

• Coupling of magnetic order and charge transport in the candidate Dirac semimetal EuCd${}_2$As${}_2$
• QS$G\hat{W}$: Quasiparticle Self consistent $GW$ with ladder diagrams in $W$
• Electronic Transport Through EuO Spin Filter Tunnel Junctions
• Benchmark for Ab Initio Prediction of Magnetic Structures based on Cluster-Multipole Theory
• Electronic structure and magnetic properties of Gd-doped and Eu-rich EuO
• Interface Metallic States between a Topological Insulator and a Ferromagnetic Insulator
• The magnetic exciton of EuS revealed by resonant inelastic x-ray scattering
• Giant non-reciprocal band structure effect in a multiferroic material