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

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

2006-12-21

arxiv.org/abs/cond-mat/0612545v2

Physical Review Letters 99, 256403 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.99.256403

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, $\rho = \rho_0 + A T^{2.5}$.

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