Pressure dependence of the conductivity and thermoelectric power is measured through the Mott transition in the layer organic conductor EtMe3P[Pd(dmit)2]2. The critical behavior of the thermoelectric effect provides a clear and objective determination of the Mott-Hubbard transition during the isothermal pressure sweep. Above the critical end point, the metal-insulator crossing, determined by the thermoelectric effect minimum value, is not found to coincide with the maximum of the derivative of the conductivity as a function of pressure. We show that the critical exponents of the Mott-Hubbard transition fall within the Ising universality class regardless of the dimensionality of the system.
@article{arxiv.1503.04630,
title = {Universality Class of the Mott Transition},
author = {M. Abdel-Jawad and R. Kato and I. Watanabe and N. Tajima and Y. Ishii},
journal= {arXiv preprint arXiv:1503.04630},
year = {2015}
}