Mott transition between a spin-liquid insulator and a metal in three dimensions

Details Mott transition between a spin-liquid insulator and a metal in three dimensions Mott transition between a spin-liquid insulator and a metal in three dimensions

2008-11-13

arxiv.org/abs/0811.2218v2

Phys. Rev. Lett. 102, 186401 (2009).

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures

Scientific paper

We study a bandwidth controlled Mott metal-insulator transition (MIT) between a Fermi liquid metal and a quantum spin-liquid insulator at half-filling in three dimensions (3D). Using a slave rotor approach, and incorporating gauge field fluctuations, we find a continuous MIT and discuss the finite temperature crossovers around this critical point. We show that the specific heat C=T ln ln (1/T) at the MIT and argue that the electrical transport on the metallic side near the transition should exhibit a `conductivity minimum' as a function of temperature. A possible candidate to test these predictions is the 3D spin liquid insulator Na4Ir3O8 which exhibits a pressure-tuned transition into a metallic phase. We also present the electron spectral function of Na4Ir3O8 at the transition.

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