Possible pairing states in the superconducting bilayer nickelate

Dheeraj Kumar Singh, Garima Goyal, Yunkyu Bang
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Abstract

We examine various possibilities for the pairing mechanisms in the recently discovered bilayer-nickelate superconductor within the Bardeen-Cooper-Schrieffer framework. Unlike earlier studies, where only a pure $d$-wave or sign-changing $s$-wave superconductivity instability was investigated, our study explores the possibilities of mixed-state superconducting instability such as the one involving both $d$- and sign-changing $s$-waves. While assuming that the superconductivity arises because of the magnetic correlations, we examine the nature of the superconducting gap function associated density of states with various possible magnetic correlation wavevectors arising out as a result of multiple pockets owing to the multiple orbitals and bilayer splitting. We also explore the effect of differences in the nature of Fermi surfaces suggested by various studies.
超导双层镍酸盐中的可能配对态
我们在巴丁-库珀-施里弗(Bardeen-Cooper-Schrieffer)框架内研究了最近发现的双层镍酸盐超导体配对机制的各种可能性。早期的研究只探讨了纯d$波或符号变化s$波超导不稳定性,与此不同,我们的研究探讨了混合态超导不稳定性的可能性,如涉及d$波和符号变化s$波的超导不稳定性。在假设超导电性是由磁相关性引起的同时,我们研究了超导间隙函数相关态密度的性质,以及由于多个口袋流向多个轨道和双层分裂而产生的各种可能的磁相关波向。我们还探讨了各种研究提出的费米面性质差异的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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