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Persistent non-metallic behavior in Sr2IrO4 and Sr3Ir2O7 at high pressures.

D A Zocco, J J Hamlin, B D White

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|June 4, 2014

Summary

This summary is machine-generated.

High pressure studies reveal that while Sr2IrO4 remains insulating, Sr3Ir2O7 approaches a metal-insulator transition. This highlights the tunability of correlated electronic states in iridium oxides under pressure.

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Area of Science:

Condensed matter physics
Materials science
Solid-state chemistry

Background:

Iridium-based 5d transition-metal oxides exhibit complex electronic behaviors.
These materials are known for strong spin-orbit coupling, influencing their electronic properties.
A key feature is the formation of a Jeff = 1/2 Mott-insulating state at ambient pressure.

Purpose of the Study:

To investigate the effect of high pressure on the electronic states of Sr2IrO4 and Sr3Ir2O7.
To explore the proximity of these materials to a pressure-induced metal-insulator transition.
To understand the role of pressure in tuning correlated electronic states in iridium oxides.

Main Methods:

High-pressure electrical resistivity measurements.
Utilized single crystals of Sr2IrO4 and Sr3Ir2O7.
Applied pressures up to 55 GPa for Sr2IrO4 and 104 GPa for Sr3Ir2O7.

Main Results:

Sr2IrO4 showed no signs of becoming metallic even at 55 GPa.
Sr3Ir2O7 exhibited a significant reduction in gap energy with increasing pressure.
The resistance of Sr3Ir2O7 decreased substantially up to 104 GPa, indicating proximity to a metallic state.

Conclusions:

Sr2IrO4 maintains its insulating state under the investigated pressure range.
Sr3Ir2O7 is close to a pressure-induced metal-insulator transition.
These findings demonstrate the pressure-dependent tunability of electronic phases in iridium-based oxides.