Journal
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
Volume 63, Issue 8, Pages -Publisher
SCIENCE PRESS
DOI: 10.1007/s11433-020-1578-3
Keywords
nickelates; superconductivity; d-wave pairing; spin susceptibility
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Funding
- National Key Research and Development Program of China [2016YFA0301800]
- General Research Fund (GRF) [HKU 173309/16P, HKU173057/17P]
- Collaborative Research Fund (CRF) of Hong Kong [C6005-17G]
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Applying a three-band model and the random phase approximation, we theoretically study the spin excitations in nickelate superconductors, which have been newly discovered. The spin excitations were found to be incommensurate in the low energy region. The spin resonance phenomenon emerged as the excitation energy increased. The intensity can be maximized at the incommensurate or commensurate momentum, depending on the out-of-plane momentum. The spin excitations reverted to incommensurate at higher energies. We also discuss the similarities and differences in the spin excitations of nickelate and cuprate superconductors. Our predicted results can be later validated in inelastic neutron scattering experiments.
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