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Author Spotlight: A Rapid, Microwave-Assisted Hydrothermal Synthesis Of Nickel Hydroxide Nanosheets
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Intertwined density waves in a metallic nickelate.

Junjie Zhang1,2, D Phelan3, A S Botana4

  • 1Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, United States. junjie@sdu.edu.cn.

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|November 27, 2020
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Nickelates exhibit a unique metal-to-metal transition driven by intertwined charge and magnetic density waves. This Fermi surface-driven phenomenon reveals novel coupling in nickelate materials.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Chemistry

Background:

  • Nickelates are diverse materials, including insulating magnets and superconductors.
  • Most stoichiometric nickelates exhibit insulating behavior, typical for late transition metal oxides.
  • Exceptions include the 3D perovskite LaNiO3 (a paramagnetic metal) and layered Ruddlesden-Popper phases R4Ni3O10.

Purpose of the Study:

  • To investigate the mechanism behind the unusual metal-to-metal transition in layered nickelates R4Ni3O10.
  • To characterize the nature of the density wave responsible for this transition.
  • To understand the coupling between charge, spin, and lattice degrees of freedom in these materials.

Main Methods:

  • Experimental investigation of R4Ni3O10 (R = La, Pr, Nd) nickelates.
  • Characterization of the incommensurate density wave with charge and magnetic properties.
  • Analysis of Fermi surface nesting and its role in the observed transition.

Main Results:

  • The metal-to-metal transition in R4Ni3O10 is caused by an incommensurate density wave.
  • This density wave possesses both charge and magnetic character.
  • The behavior resembles metallic density waves in chromium rather than insulating stripes in single-layer nickelates.

Conclusions:

  • The identified density waves are Fermi surface-driven, indicating a novel ordering mechanism.
  • This mechanism highlights a unique coupling of charge, spin, and lattice degrees of freedom in layered nickelates.
  • The findings differentiate these materials from both single-layer nickelates and 3D perovskites.