title: Universality class of the mott transition.
abstract: Pressure dependence of the conductivity and thermoelectric power is measured through the Mott transition in the layer organic conductor EtMe_{3}P[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.
authors: Condensed Molecular Materials Laboratory, RIKEN, The Institute of Physical and Chemical Research, 2-1, Hirosawa, Wako, Saitama 351-0198, Japan.
authors: M
authors: M
authors: Abdel-Jawad
authors: Condensed Molecular Materials Laboratory, RIKEN, The Institute of Physical and Chemical Research, 2-1, Hirosawa, Wako, Saitama 351-0198, Japan.
authors: R
authors: R
authors: Kato
authors: Advanced Meson Science Laboratory, RIKEN Nishina Center, 2-1, Hirosawa, Wako, Saitama 351-0198, Japan.
authors: I
authors: I
authors: Watanabe
authors: Department of Physics, Toho University, Miyama 2-2-1, Funabashi-shi, Chiba 274-8510, Japan.
authors: N
authors: N
authors: Tajima
authors: Department of Physics, College of Engineering, Shibaura Institute of Technology, 307 Fukasaku, Minuma-ku, Saitama 337-8570, Japan.
authors: Y
authors: Y
authors: Ishii