We report thermodynamic magnetization measurements of two-dimensional electrons in several high mobility Si metal-oxide-semiconductor field-effect transistors. We provide evidence for an easily polarizable electron state in a wide density range from insulating to deep into the metallic phase. The temperature and magnetic field dependence of the magnetization is consistent with the formation of large-spin droplets in the insulating phase. These droplets melt in the metallic phase with increasing density and temperature, although they survive up to large densities.
@article{arxiv.1211.3536,
title = {Spin-Droplet State of an Interacting 2D Electron System},
author = {N. Teneh and A. Yu. Kuntsevich and V. M. Pudalov and M. Reznikov},
journal= {arXiv preprint arXiv:1211.3536},
year = {2012}
}