论文标题
ndnio $ _2 $和cacuo $ _2 $中的超导性和反铁磁性
Superconductivity and Antiferromagnetism in NdNiO$_2$ and CaCuO$_2$: A Cluster DMFT Study
论文作者
论文摘要
我们对NDNIO $ _2 $的最小型号和Cacuo $ _2 $进行了比较$ 2 $ 2 $真实的太空群集DMFT研究，并使用Nambu形式主义，允许超导和反铁磁性秩序获得。我们在温度和掺杂中产生相图。我们发现，对于像铜酸盐一样，化学计量化合物是抗铁磁性的。我们发现，通过低掺杂时的抗铁磁性发作，在掺杂范围内具有较小的共存区域的超导性，并且过渡温度在高掺杂时变得不高。对于两种化合物，超导性都在同一孔掺杂周围出现，但需要从一半填充镍的偏差。抗铁磁和超导顺序都导致$ d_ {x^2-y^2} $ fermi表面纸的部分间隙。我们对铜酸盐和镍酸盐的类似结果表明，镍超导性是杯形的。我们将结果与实验相图进行比较。
We perform a comparative $2 \times 2$ real space cluster DMFT study on minimal models for NdNiO$_2$ and CaCuO$_2$ obtained from downfolding DFT states, using a Nambu formalism that allows for both superconducting and antiferromagnetic order. We produce a phase diagram in temperature and doping. We find that for the nickelate, like the cuprate, the stoichiometric compound is antiferromagnetic. We find superconductivity in a doping range bounded, with a small coexistence region, by the onset of antiferromagnetism at low doping and with transition temperature becoming immeasurably small at high doping. Superconductivity emerges at around the same hole doping for both compounds, but requires a larger deviation from half filling for the nickelate. Both antiferromagnetic and superconducting order lead to a partial gapping of the $d_{x^2-y^2}$ Fermi surface sheet. Our similar results for the cuprate and nickelate suggest that nickelate superconductivity is cupratelike. We compare our results to the experimental phase diagram.
