Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 26, Issue 25, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/26/25/255603
Keywords
iridates; metal-insulator transition; high pressure
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Funding
- National Nuclear Security Administration (NNSA) under the Stewardship Science Academic Alliance program through the US Department of Energy ( DOE) [DE-52-09NA29459.]
- DOE Grant [DE-FG02-04-ER46105]
- DOE-NNSA [DE-NA0002014, DE-AC52-07NA27344]
- U S National Science Foundation [DMR-07-04480]
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Iridium-based 5d transition-metal oxides are attractive candidates for the study of correlated electronic states due to the interplay of enhanced crystal-field, Coulomb and spin-orbit interaction energies. At ambient pressure, these conditions promote a novel J(eff) = 1/2 Mottinsulating state, characterized by a gap of the order of similar to 0.1 eV. We present high-pressure electrical resistivity measurements of single crystals of Sr2IrO4 and Sr3Ir2O7. While no indications of a pressure-induced metallic state up to 55 GPa were found in Sr2IrO4, a strong decrease of the gap energy and of the resistance of Sr3Ir2O7 between ambient pressure and 104 GPa confirm that this compound is in the proximity of a metal-insulator transition.
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