Mott insulator-to-metal transition in yttrium-doped CaIrO3

Abstract

We report on the study of insulator-to-metal transition in post-perovskite compound CaIrO3. It is discovered that a gradual chemical substitution of calcium by yttrium leads to the onset of strong metallic behavior in this compound. This observation is in stark contrast to BaIrO3, which preserves its Mott insulating behavior despite excess of charge carriers due to yttrium doping. Magnetic measurements reveal that both compounds tend to exhibit magnetic character irrespective of the chemical substitution of Ca or Ba. We analyze these unusual observations in light of recent researches that suggest that unlike BaIrO3, CaIrO3 does not necessarily possess j = 1/2 ground state due to structural distortion. The insulator-to-metal transition in CaIrO3 will spur new researches to explore more exotic ground state, including superconductivity, in post-perovskite Mott insulators.

arXiv comment5 pages, 4 figures

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Cited by in corpus (6)

• $J_{eff}=1/2$ Mott Insulating State in Rh and Ir Fluorides
• Magnetic fluctuations driven insulator-to-metal transition in Ca(Ir${}_{1-x}$Ru${}_x$)O${}_3$
• Novel Block Excitonic Condensate at $n=3.5$ in a Spin-Orbit Coupled $t_{2g}$ Multiorbital Hubbard Model
• A $j_{\mathrm{eff}}=1/2$ pseudospinon continuum in CaIrO${}_3$
• Nonconventional magnetic phenomena in neodymium thin film
• Quantum magnetic properties and metal-to-insulator transition in chemically doped calcium ruthenate perovskite