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GdI₂: A New Ferromagnetic Excitonic Solid?

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arxiv 0804.3940 v2 pith:IUCXJU7B submitted 2008-04-24 cond-mat.str-el cond-mat.mtrl-sci

GdI₂: A New Ferromagnetic Excitonic Solid?

classification cond-mat.str-el cond-mat.mtrl-sci
keywords excitonicferromagneticstatecorrelatedgroundsolidtemperaturesargued
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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