Special Condensed Matter Seminar: "Charge Order in Trilayer Nickelates"

Speaker Dr. Junjie Zhang, Argonne National Laboratory
Date: 5/31/2016
Time: 11 a.m.
Location: 280 MRL
Event Contact: Lance Cooper
Sponsor: Department of Physics
Event Type: Seminar/Symposium

Nickelates containing square-planar coordinated Ni1+/Ni2+ ions are a potential analogue to the high temperature superconducting cuprates, and might provide a counterpart of the cuprates to be investigated for unconventional superconductivity and/or various forms of collective fluctuations. In this talk, I will outline our efforts to obtain single crystals of such nickelates, exemplified by La4Ni3O8, and the discovery of real-space charge stripes in this compound associated with a semiconductor-insulator transition. I will discuss the model we have proposed to account for the physical properties. The existence of stripe phase in La4Ni3O8 validates the hypothesis that low-valence layered nickelates are similar to high temperature superconducting cuprates. Our results also suggest that other competing orders might exist in this strongly correlated system under doping. I will also discuss our observations of charge superlattice peaks on its parent compound La4Ni3O10 as well as Pr4Ni3O10. Our findings challenge standing theories of charge density wave formation in these trilayer Ruddlesden-Popper phases.

Junjie Zhang, Yu-Sheng Chen, D. Phelan, Hong Zheng, M. R. Norman, and J. F. Mitchell. "Stacked charge stripes in quasi-two-dimensional trilayer nickelate La4Ni3O8" arXiv: 1601.03711.

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