The discovery of superconductivity in Sr-doped NdNiO2 is a crucial breakthrough in the long pursuit for nickel oxide materials with electronic and magnetic properties similar to those of the cuprates. NdNiO2 is the infinite-layer member of a family of square-planar nickelates with general chemical formula Rn+1NinO2n+2 (R = La, Pr, Nd, n = 2, 3,...∞). In this Rapid Communication, we investigate superconductivity in the trilayer member of this series (R4Ni3O8) using a combination of first-principles and $$\textit{t–J}$$ model calculations. R4Ni3O8 compounds resemble cuprates more than RNiO2 materials in that only Ni-dn2–y2 bands cross the Fermi level, they exhibit a largely reduced charge transfer energy, and as a consequence superexchange interactions are significantly enhanced. In this work, we find that the superconducting instability in doped R4Ni3O8 compounds is considerably stronger with a maximum gap about four times larger than that in Sr0.2Nd0.8NiO2.
Nica, Emilian M., Krishna, Jyoti, Yu, Rong, et al., "Theoretical investigation of superconductivity in trilayer square-planar nickelates," Physical Review B 102, no. 2 (2020), https://doi.org/10.1103/physrevb.102.020504
@article{osti_1803296,
author = {Nica, Emilian M. and Krishna, Jyoti and Yu, Rong and Si, Qimiao and Botana, Antia S. and Erten, Onur},
title = {Theoretical investigation of superconductivity in trilayer square-planar nickelates},
annote = {The discovery of superconductivity in Sr-doped NdNiO2 is a crucial breakthrough in the long pursuit for nickel oxide materials with electronic and magnetic properties similar to those of the cuprates. NdNiO2 is the infinite-layer member of a family of square-planar nickelates with general chemical formula Rn+1NinO2n+2 (R = La, Pr, Nd, n = 2, 3,...∞). In this Rapid Communication, we investigate superconductivity in the trilayer member of this series (R4Ni3O8) using a combination of first-principles and $\textit{t–J}$ model calculations. R4Ni3O8 compounds resemble cuprates more than RNiO2 materials in that only Ni-dn2–y2 bands cross the Fermi level, they exhibit a largely reduced charge transfer energy, and as a consequence superexchange interactions are significantly enhanced. In this work, we find that the superconducting instability in doped R4Ni3O8 compounds is considerably stronger with a maximum gap about four times larger than that in Sr0.2Nd0.8NiO2.},
doi = {10.1103/physrevb.102.020504},
url = {https://www.osti.gov/biblio/1803296},
journal = {Physical Review B},
issn = {ISSN 2469-9950},
number = {2},
volume = {102},
place = {United States},
publisher = {American Physical Society (APS)},
year = {2020},
month = {07}}
The 17th International Conference on High Pressure in Semiconductor Physics (HPSP-17) & Workshop on High-pressure Study on Superconducting, Proc. 17th Int. Conf. on High Pressure in Semiconductor Physics & Workshop on High-pressure Study on Superconductinghttps://doi.org/10.7567/JJAPCP.6.011106