Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session U48: Superconductivity: Nickelates II (Theory and Models)
2:30 PM–4:54 PM,
Thursday, March 5, 2020
Room: Mile High Ballroom 1A
Sponsoring
Unit:
DCMP
Chair: B. Moritz
Abstract: U48.00005 : Two-band model for magnetism and superconductivity in nickelates Nd1-xSrxNiO2
Presenter:
Lun-Hui Hu
(University of California, San Diego)
Authors:
Lun-Hui Hu
(University of California, San Diego)
Congjun Wu
(University of California, San Diego)
provides a new opportunity for studying strongly correlated
unconventional superconductivity.
The single-hole Ni+ (3d9) configuration in the parent compound
NdNiO2 is similar to that of Cu2+ in cuprates.
We suggest that after doping, the intra-orbital spin-singlet and
inter-orbital spin-triplet double-hole
(doublon) configurations of Ni2+ are competing, and we
construct a two-band Hubbard model by including both
the 3dx^2-y^2 and 3dxy-orbitals.
The effective spin-orbital super-exchange model in the undoped case
is a variant of the SU(4) Kugel-Khomskii model augmented by
symmetry breaking terms.
Upon doping, the effective exchange interactions between spin-1/2 single-holes, spin-1 (triplet) doublons, and singlet doublons are derived.
Possible superconducting pairing symmetries are classified in accordance
to the D4h crystalline symmetry, and their connections to the
superexchange interactions are analyzed.
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