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.
@article{arxiv.0804.3940,
title = {GdI_2: A New Ferromagnetic Excitonic Solid?},
author = {A. Taraphder and M. S. Laad and L. Craco and A. N. Yaresko},
journal= {arXiv preprint arXiv:0804.3940},
year = {2009}
}
Comments
4 pages, 4 figures, changed Fig. 1 with extended energy scale, added text and references, author list shortened