Strain-controlled band engineering and self-doping in ultrathin LaNiO${}_3$ films

Abstract

We report on a systematic study of the temperature-dependent Hall coefficient and thermoelectric power in ultra-thin metallic LaNiO${}_3$ films that reveal a strain-induced, self-doping carrier transition that is inaccessible in the bulk. As the film strain varies from compressive to tensile at fixed composition and stoichiometry, the transport coefficients evolve in a manner strikingly similar to those of bulk hole-doped superconducting cuprates with varying doping level. Density functional calculations reveal that the strain-induced changes in the transport properties are due to self-doping in the low-energy electronic band structure. The results imply that thin-film epitaxy can serve as a new means to achieve hole-doping in other (negative) charge-transfer gap transition metal oxides without resorting to chemical substitution.

References in corpus (8)

• Orbital order and possible superconductivity in LaNiO3/LaMO3 superlattices
• Phenomenology of the normal state in-plane transport properties of high-$T_c$ cuprates
• Giant Tunneling Electroresistance Effect Driven by an Electrically Controlled Spin Valve at a Complex Oxide Interface
• Fermi surfaces, electron-hole asymmetry and correlation kink in a three-dimensional Fermi liquid LaNiO${}_3$
• Termination Control of the Interface Dipole in La${}_{0.7}$Sr${}_{0.3}$MnO${}_3$/Nb:SrTiO${}_3$ (001) Schottky Junctions
• Chemical control of orbital polarization in artificially structured transition-metal oxides: La2NiXO6 (X=B, Al, Ga, In) from first principles
• Unified electronic phase diagram for hole-doped high-Tc cuprates
• Modulation Doping of a Mott Quantum Well by a Proximate Polar Discontinuity

Cited by in corpus (5)

• Physics of ultrathin films and heterostructures of rare earth nickelates
• Orbital Polarization in Strained LaNiO${}_3$: Structural Distortions and Correlation Effects
• Field-effect diode based on electron-induced Mott transition in NdNiO3
• Electronic structure of buried LaNiO3 layers in (111)-oriented LaNiO3/LaMnO3 superlattices probed by soft x-ray ARPES
• Enhancement of the thermoelectric power by electronic correlations in bad metals: a study of the Kelvin formula