A magnetotransport study in magnetically doped (Cd,Mn)Te 2D quantum wells reveals an apparent metal-insulator transition as well as an anomalous intermediate phase just on its metallic side. This phase is characterized by colossal magnetoresistance-like phenomena, which are assigned to the phase separation of the electron fluid and the associated emergence of ferromagnetic bubbles.
@article{arxiv.cond-mat/0509189,
title = {An Intermediate Phase at the Metal-Insulator Boundary in a Magnetically Doped Two-Dimensional Electron System},
author = {J. Jaroszynski and T. Andrearczyk and G. Karczewski and J. Wróbel and T. Wojtowicz and Dragana Popovic and T. Dietl},
journal= {arXiv preprint arXiv:cond-mat/0509189},
year = {2010}
}