论文标题
在无限层镍中超导性的独特配对对称性
Distinct pairing symmetries of superconductivity in infinite-layer nickelates
论文作者
论文摘要
我们报告了关于新发现的超导镍nd $ _ {1-x} $ sr $ _ {x} $ nio $ _ {2} $的对称对称性的理论预测，该预测是基于重态化的均值菲尔德理论，用于[physship of phys phys phys phys physship。 Rev. B \ TextBf {101}，020501（R）]。对于关键参数的实际值，我们发现在小掺杂区域中的间隙（$ d+is $ d+is $） - 波配对状态在大型掺杂区域中的无间隙$ d $ - 波配对状态，并伴随着关键掺杂处的突然的费米表面变化。我们的整体阶段图还显示了如果电子杂交相对较小，则可能会出现（$ d+为$） - 至$ s $ - 波过渡。无论哪种情况，低掺杂（$ d+is $） - 波状态是一个散布的超导状态，具有损坏的时间反转对称性。我们的结果与最新的实验观察符合定性一致，并预测了未来测量中需要检查的几个关键特征。
We report theoretical predictions on the pairing symmetry of the newly discovered superconducting nickelate Nd$_{1-x}$Sr$_{x}$NiO$_{2}$ based on the renormalized mean-field theory for a generalized model Hamiltonian proposed in [Phys. Rev. B \textbf{101}, 020501(R)]. 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 gapless $d$-wave pairing state in the large doping region, accompanied by 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.
