Distinct pairing symmetries of superconductivity in infinite-layer nickelates
Zhan Wang, Guang-Ming Zhang, Yi-feng Yang, Fu-Chun Zhang
DOI 10.1103/PhysRevB.102.220501 · Physical Review B
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Abstract
We report theoretical predictions on the pairing symmetry of the newly discovered superconducting nickelate Nd1−xSrxNiO2 based on the renormalized mean-field theory for a generalized model Hamiltonian. For practical values of the key parameters, we find a transition between a gapped (d+is)-wave pairing state in the small doping region to a nodal d-wave pairing state in the large doping region, accompanying with an abrupt Fermi surface change at the critical doping. Our overall phase diagram also shows the possibility of a (d+is)- to s-wave transition if the electron hybridization is relatively small. In either case, the low-doping (d+is)-wave state is a gapped superconducting state with broken time-reversal symmetry. Our results are in qualitative agreement with recent experimental observations and predict several key features to be examined in future measurements.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nd1-xSrxNiO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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