Journal of Physics: Condensed Matter | VOL. 34
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Honeycomb lattice iridate on the verge of Mott-collapse

Publication Date Sep 21, 2022

Abstract

A new honeycomb lattice iridate (La,Na)IrO3 (≈LaNaIr2O6) is successfully synthesized from the spin–orbit coupled Mott insulator Na2IrO3 by replacing the interlayer Na+ ions with La3+ ions. (La,Na)IrO3 shows a finite Sommerfeld term in heat capacity and a −lnT dependence of resistivity, indicating a realization of a metallic state driven by a Mott collapse. Furthermore, crystal structure analysis reveals the formation of Ir zig-zag chains with metal–metal bonding, increasing kinetic energy resulting in the Mott collapse. This observation would be due to a Mott collapse induced in a J eff = 1/2 spin–orbit coupling Mott insulator with an Ir honeycomb lattice by topochemical control of the ionic configuration.

Concepts

Honeycomb Lattice Iridate Term In Heat Capacity Honeycomb Lattice Heat Capacity Control Of Configuration Finite Term Formation Of Chains Lattice Iridate lnT Dependence Topochemical Control

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