Thermoelectric behavior of Ruddlesden-Popper series iridates

Abstract

The goal of this work is studying the evolution of thermoelectric transport across the members of the Ruddlesden-Popper series iridates Srn+1IrnO3n+1, where a metal-insulator transition driven by bandwidth change occurs, from the strongly insulating Sr2IrO4 to the metallic non Fermi liquid behavior of SrIrO3. Sr2IrO4 (n=1), Sr3Ir2O7 (n=2) and SrIrO3 (n=inf.) polycrystals are synthesized at high pressure and characterized by structural, magnetic, electric and thermoelectric transport analyses. We find a complex thermoelectric phenomenology in the three compounds. Thermal diffusion of charge carriers accounts for the Seebeck behavior of Sr2IrO4, whereas additional drag mechanisms come into play in determining the Seebeck temperature dependence of Sr3Ir2O7 and SrIrO3. These findings reveal close relationship between magnetic, electronic and thermoelectric properties, strong coupling of charge carriers with phonons and spin fluctuations as well as relevance of multiband description in these compounds.

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Cited by in corpus (10)

• Spin-orbit semimetal SrIrO${}_3$ in the two-dimensional limit
• Balanced electron-hole transport in spin-orbit semimetal SrIrO3 heterostructures
• Growth and engineering of perovskite SrIrO3 thin films
• Spectral functions of Sr${}_2$IrO${}_4$: theory versus experiment
• Low temperature ferromagnetism in perovskite SrIrO${}_3$ films
• Non-local Coulomb correlations in pure and electron-doped ${\mathrm{Sr}}_2{\mathrm{IrO}}_4$: spectral functions, Fermi surface and pseudogap-like spectral weight distributions from oriented cluster dynamical mean field theory
• Anomalous scaling law for thermoelectric transport of 2D-confined electrons in an organic molecular system
• Epitaxial stabilization of Sr3Ir2O7 thin films
• Anomalous pressure dependence of the electronic transport and anisotropy in SrIrO3 films
• Thermoelectric transport properties of the quasi-one-dimensional dimer-Mott insulator ${\beta }^{\prime }$-(BEDT-TTF)${}_2$ICl${}_2$