Journal
PHYSICAL REVIEW B
Volume 87, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.235127
Keywords
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Funding
- US National Science Foundation [DMR-0856234, EPS-0814194]
- US Department of Energy Office of Science, Basic Energy Sciences [DE-FG02-97ER45653]
- US Dept. of Energy [DE-FG02-98ER45707]
- Direct For Mathematical & Physical Scien [0856234] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [GRANTS:13816817] Funding Source: National Science Foundation
- Division Of Materials Research [0856234] Funding Source: National Science Foundation
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Sr3Ir2O7 exhibits a novel J(eff) = 1/2 insulating state that features a splitting between Jeff = 1/2 and 3/2 bands due to spin-orbit interaction. We report a metal-insulator transition in Sr3Ir2O7 via either dilute electron doping (La3+ for Sr2+) or application of high pressure up to 35 GPa. Our study of single-crystal Sr3Ir2O7 and (Sr1-xLax)(3)Ir2O7 reveals that application of high hydrostatic pressure P leads to a drastic reduction in the electrical resistivity by as much as six orders of magnitude at a critical pressure P-C = 13.2 GPa, manifesting a closing of the gap; but further increasing P up to 35 GPa produces no fully metallic state at low temperatures, possibly as a consequence of localization due to a narrow distribution of bonding angles theta. In contrast, slight doping of La3+ ions for Sr2+ ions in Sr3Ir2O7 readily induces a robust metallic state in the resistivity at low temperatures; the magnetic ordering temperature is significantly suppressed but remains finite for (Sr0.95La0.05)(3)Ir2O7 where the metallic state occurs. The results are discussed along with comparisons drawn with Sr2IrO4, a prototype of the J(eff) = 1/2 insulator.
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