GdI2: a new ferromagnetic excitonic solid?

  title={GdI2: a new ferromagnetic excitonic solid?},
  author={A. Taraphder and Mukul S. Laad and Luis Craco and Alexander N. Yaresko},
  journal={Physical review letters},
  volume={101 13},
The two-dimensional, colossal magnetoresistive system GdI2 develops an unusual metallic state below its ferromagnetic transition and becomes insulating at low temperatures. We argue 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… 
15 Citations
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