Journal
PHYSICAL REVIEW B
Volume 102, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.102.220501
Keywords
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Funding
- National Key Research and Development Program of MOST of China [2016YFYA0300300, 2017YFA0302902, 2017YFA0303103]
- National Natural Science Foundation of China [11774401, 11674278]
- State Key Development Program for Basic Research of China [2014CB921203, 2015CB921303]
- Strategic Priority Research Program of CAS [XDB28000000, XDB33010100]
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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.
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