Mott Transition in a Valence Bond Solid Insulator with a Triangular Lattice

Abstract

We have investigated the Mott transition in a quasi-two-dimensional Mott insulator EtMe${}_3$P[Pd(dmit)${}_2$]${}_2$ with a spin-frustrated triangular lattice in hydrostatic pressure and magnetic field. In the pressure-temperature ($P$-$T$) phase diagram, a valence bond solid phase is found to neighbor the superconductor and metal phases at low temperatures. The profile of the phase diagram is common to those of Mott insulators with antiferromagnetic order. In contrast to the antiferromagnetic Mott insulators, the resistivity in the metallic phase exhibits anomalous temperature dependence, $\rho ={\rho }_0+A{T}^{2.5}$.

4 pages, 4 figures

References in corpus (1)

• Dimensional reduction at a quantum critical point

Cited by in corpus (4)

• Global phase diagrams of frustrated quantum antiferromagnets in two dimensions: doubled Chern-Simons theory
• Dynamics and transport of the Z_2 spin liquid: application to kappa-(ET)2Cu2(CN)3
• Absence of superconductivity in the half-filled band Hubbard model on the anisotropic triangular lattice
• Insulator-metal transition on the triangular lattice