Many questions related to the metal-insulator transition of the Mott type remains unanswered to this day. In this seminar, I will present isothermal pressure measurements of the conductivity, the thermoelectric effect and the Hall coefficient within a Helium pressure medium in a geometrically frustrated Mott insulator, EtMe3P[Pd(dmit)2]2. One of the first surprising result of this research is that the Seebeck coefficient changes drastically at the Mott transition. This enables us to objectively estimate the Mott transition critical temperature and pressure in this compound[1]. Comparison of this estimate of the Mott transition with the conductivity data contradicts with the assumptions of previous studies [2, 3]. In another surprising result, related to the Hall coefficient measurement, the carrier number of EtMe3P[Pd(dmit)2]2 is found to be almost temperature and pressure independent in its metallic state. Discussions of the universality class of the Mott transition will be made and compared to previous results in other Mott insulators [2, 3, 4].

[1] M. Abdel-Jawad, R. Kato, I. Watanabe, N. Tajima, and Y. Ishii, Phys. Rev. Lett. 114, 106401 (2015).

[2] P. Limelette, A. Georges, D. Jérome, P. Wzietek, P. Metcalf & J. M. Honig, Science 302, 89 (2003).

[3] F. Kagawa , K. Miyagawa & K. Kanoda, Nature 436, 534 (2005).

[4] L. Bartosch, M. de Souza & M. Lang, Phys. Rev. Lett. 104, 245701 (2010).