GdI_2: A New Ferromagnetic Excitonic Solid?

Abstract

The two-dimensional, colossal magnetoresistive system GdI_2 develops an unusual metallic state below its ferromagnetic transition and becomes insulating at low temperatures. It is argued that this geometrically frustrated, correlated poor metal is a possible candidate for a ferromagnetic excitonic liquid. The renormalized Fermi surface supports a further breaking of symmetry to a charge ordered, excitonic solid ground state at lower temperatures via order by disorder mechanism. Several experimental predictions are made to investigate this unique orbitally correlated ground state.

4 pages, 4 figures, changed Fig. 1 with extended energy scale, added text and references, author list shortened

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Cited by in corpus (12)

• Frustration-induced insulating chiral spin state in itinerant triangular-lattice magnets
• Preformed excitonic liquid route to a charge density wave in 2H-TaSe${}_2$
• Gadolinium halide monolayers: a fertile family of two-dimensional 4f magnets
• An extended Falicov-Kimball model on a triangular lattice
• Formation of charge and spin ordering in strongly correlated electron systems
• Ground state phase diagram of a spinless, extended Falicov-Kimball model on the triangular lattice
• Thermodynamic studies of the two dimensional Falicov-Kimball model on a triangular lattice
• Study of ground state phases for spin-1/2 Falicov-Kimball model on a triangular lattice
• Phase transitions in a spinless, extended Falicov-Kimball model on the triangular lattice
• Orbital Magnetic Field Driven Metal-Insulator Transition in Spinless Extended Falicov-Kimball Model on A Triangular Lattice
• Metal-Insulator Transition and Band Magnetism in the Spin-$1/2$ Falicov-Kimball Model on A Triangular Lattice with External Magnetic Field
• The Role of Intra- and Inter-site exchange correlations in the Extended Falicov-Kimball Model on a Triangular Lattice