Matter
Volume 2, Issue 5, 6 May 2020, Pages 1296-1306
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Article
Overlooked Transportation Anisotropies in d-Band Correlated Rare-Earth Perovskite Nickelates

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Highlights

  • Transport anisotropy is established by confining ReNiO3 within low dimensions

  • In-plane symmetry of 2D-ReNiO3 causes intrinsic anisotropic thermistor transport

  • Interfacial strain extrinsically amplifies transport anisotropies within 2D-ReNiO3

  • Anisotropy introduces new freedoms to modify transport of correlated perovskites

Progress and Potential

Anisotropies in electronic transportations conventionally originate from the nature of low symmetries in crystal structures. Beyond conventional expectations, here we demonstrate pronounced anisotropies in the inter-band Coulomb repulsion-dominated electronic transportation behaviors in the low-dimensional perovskite family of rare-earth nickelates (ReNiO3). It unveils the overlooked role of the electronic orbital directionality within low-dimensional correlated perovskites that can trigger anisotropic transportation behaviors despite their relatively symmetric crystal structures.

Summary

Anisotropies in electronic transportations conventionally originate from the nature of low symmetries in crystal structures and were not anticipated for perovskite oxides with crystal asymmetries much smaller than, e.g., van der Waals or topological crystal. Beyond conventional expectations, here we demonstrate pronounced anisotropies in the inter-band Coulomb repulsion-dominated electronic transportation behaviors in the low-dimensional perovskite family of rare-earth nickelates (ReNiO3). The in-plane orbital entropy associated to the in-plane symmetry of the NiO6 octahedron within ReNiO3 causes intrinsic anisotropies for the gradual orbital transition with temperature to regulate their thermistor transportations. Extrinsically imparting biaxial interfacial strains amplifies the anisotropies in the electronic transportation of ReNiO3. It unveils the overlooked role of orbital directionalities within low-dimensional correlated perovskites that triggers anisotropic transportations despite their higher crystal symmetries, and this introduces new freedoms to regulate their correlated transportations.

Material Advancement Progression

MAP1: Discovery

Keywords

perovskite oxides
electron correlation
anisotropy
metal-to-insulator transition
thermistor
rare-earth nickelates

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