Shashkin A A, Anissimova S, Sakr M R, Kravchenko S V, Dolgopolov V T, Klapwijk T M
Physics Department, Northeastern University, Boston, Massachusetts 02115, USA.
Phys Rev Lett. 2006 Jan 27;96(3):036403. doi: 10.1103/PhysRevLett.96.036403. Epub 2006 Jan 24.
Thermodynamic measurements reveal that the Pauli spin susceptibility of strongly correlated two-dimensional electrons in silicon grows critically at low electron densities--behavior that is characteristic of the existence of a phase transition.