Tunable Charge and Spin Order in PrNiO${}_3$ Thin Films and Superlattices

Abstract

We have used polarized Raman scattering to probe lattice vibrations and charge ordering in 12 nm thick, epitaxially strained PrNiO${}_3$ films, and in superlattices of PrNiO${}_3$ with the band-insulator PrAlO${}_3$. A carefully adjusted confocal geometry was used to eliminate the substrate contribution to the Raman spectra. In films and superlattices under tensile strain, which undergo a metal-insulator transition upon cooling, the Raman spectra reveal phonon modes characteristic of charge ordering. These anomalous phonons do not appear in compressively strained films, which remain metallic at all temperatures. For superlattices under compressive strain, the Raman spectra show no evidence of anomalous phonons indicative of charge ordering, while complementary resonant x-ray scattering experiments reveal antiferromagnetic order associated with a modest increase in resistivity upon cooling. This confirms theoretical predictions of a spin density wave phase driven by spatial confinement of the conduction electrons.

arXiv commentPRL, in press

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• Structural and physical properties of trilayer nickelates $R_4$Ni${}_3$O${}_{10}$ ($R=$ La, Pr and Nd)
• Strange semimetal dynamics in SrIrO${}_3$
• Anomalous electron transport in epitaxial NdNiO${}_3$ films
• Selective formation of apical oxygen vacancies in La${}_{2-x}$Sr${}_x$CuO${}_4$
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• Epitaxial strain modulated electronic properties of interface controlled nickelate superlattice
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• Dimensionality-tuned electronic structure of nickelate superlattices explored by soft-x-ray angle resolved photoelectron spectroscopy
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• Topotactically induced oxygen vacancy order in nickelate single crystals
• Conductivity noise across temperature driven transitions of rare-earth nickelate heterostructures
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• Non-collinear and strongly asymmetric polar moments at back-gated SrTiO3 interfaces
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• Disentangling transport mechanisms in a correlated oxide by photoinduced charge injection
• Multiorbital character of the density wave in trilayer nickelate superconductors
• Probing electronic and magnetic transitions of short periodic nickelate superlattices using synchrotron x-ray