Superconductivity in trilayer Nickelates
ORAL
Abstract
Infinite-layer NdNiO2 has recently been shown to exhibit superconductivity upon Sr-doping [1].
For doped NdNiO2, it is believed that pairing in the superconducting phase occurs mainly in the Ni dx2-y2 band [2]. In contrast to the Cu-based high-Tc superconductors, the parent RNiO2 (R=La, Nd) phases are not insulating-in spite of containing Ni1+: d9 ions-due to the appearance of rare-earth 5d-bands in the Fermi surface (FS) [2]. RNiO2 materials are members of a larger family of layered nickelates Rn+1(NiO2)nO2 with n= 2, 3, ... ∞ determining the number of NiO2 planes along the c-axis. Here, we consider alternate trilayer compounds [3] where the rare-earth bands are pushed away from the FS which only includes three Ni- dx2-y2 sheets. We study superconductivity in these compounds in several doping regimes using a t-J model. We compare and contrast the pairing instabilities in the tri- and infinite-layer cases.
[1] D. Li, K. et al, Nature 572, 624 (2019).
[2] X. Wu et al, arXiv:1909.03015.
[3] J. Zhang et al, Nature Physics 13, 864 (2017).
For doped NdNiO2, it is believed that pairing in the superconducting phase occurs mainly in the Ni dx2-y2 band [2]. In contrast to the Cu-based high-Tc superconductors, the parent RNiO2 (R=La, Nd) phases are not insulating-in spite of containing Ni1+: d9 ions-due to the appearance of rare-earth 5d-bands in the Fermi surface (FS) [2]. RNiO2 materials are members of a larger family of layered nickelates Rn+1(NiO2)nO2 with n= 2, 3, ... ∞ determining the number of NiO2 planes along the c-axis. Here, we consider alternate trilayer compounds [3] where the rare-earth bands are pushed away from the FS which only includes three Ni- dx2-y2 sheets. We study superconductivity in these compounds in several doping regimes using a t-J model. We compare and contrast the pairing instabilities in the tri- and infinite-layer cases.
[1] D. Li, K. et al, Nature 572, 624 (2019).
[2] X. Wu et al, arXiv:1909.03015.
[3] J. Zhang et al, Nature Physics 13, 864 (2017).
*Supported by the DOE BES Award \# DE-SC0018197 and the Robert A. Welch Foundation Grant No. C-1411 (Q.S.)
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Presenters
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Emilian Nica
- Department of Physics, Arizona State Univ
- Arizona State University
- Department of Physics, Arizona State University
- Arizona State Univ
- Arizona State Unviversity