Bulletin of the American Physical Society
APS March Meeting 2021
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session J49: Superconductivity in Infinite-Layer Nickelates
3:00 PM–6:00 PM,
Tuesday, March 16, 2021
Sponsoring Unit: DCMP
Chair: George Swatsky, University of British Columbia
Abstract: J49.00002 : Accessing Experimentally Inaccessible States in Infinite Layer Nickelate*
3:36 PM–4:12 PM
In the (experimentally inaccessible) AFM ordered phase, a Ni d(z2) flat band exactly lying at the Fermi energy appears on the entire kz=π/c zone faces, leading to a 1D-like van Hove singularity (vHs). This vHs supports spin, charge, and lattice instabilities. However, these symmetry-breaking orders are not observed, since the magnetic ordering and structural instabilities may be overcome by thermal or quantum zero-point motions of oxygen and non-adiabatic electron-lattice coupling due to the narrowness of the vHs. Our results from first principles approach indicate that this strongly AFM correlated and conducting spin-liquid phase with significantly involved Ni d(z2) orbital establishes the platform for superconductivity in the hole-doped NdNiO2.
*I acknowledge W. E. Pickett and M.-Y. Choi for fruitful collaborations. This research was supported by NRF of Korea Grants NRF-2019R1A2C1009588.
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