Journal
PHYSICAL REVIEW B
Volume 94, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.081105
Keywords
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Funding
- Materials Sciences and Engineering Division, Basic Energy Sciences, Office of Science, U.S. DOE
- MINECO [MAT2013-44673-R]
- Xunta de Galicia [EM2013/037]
- Spanish Government through Ramon y Cajal Program [RYC-2011-09024]
- Department of Energy [DE-FG02-04ER46111]
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Ab initio calculations allow us to establish a close connection between the Ruddlesden-Popper layered nickelates and cuprates not only in terms of filling of d levels (close to d(9)) but also because they show Ni1+(S = 1/2)/Ni2+(S = 0) stripe ordering. The insulating charge-ordered ground state is obtained from a combination of structural distortions and magnetic order. The Ni2+ ions are in a low-spin configuration (S = 0) yielding an antiferromagnetic arrangement of Ni1+ S = 1/2 ions like the long-sought spin-1/2 antiferromagnetic insulator analog of the cuprate parent materials. The analogy extends further with the main contribution to the bands near the Fermi energy coming from hybridized Ni d(x2-y2) and O p states.
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