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arXiv 2401.16151cond-mat.supr-concond-mat.str-el
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多层镍酸盐超导体 La$_{3}$Ni$_{2}$O$_{7}$ 中磁激发的理论

Theory of magnetic excitations in multilayer nickelate superconductor La$_{3}$Ni$_{2}$O$_{7}$

Steffen Bötzel, Frank Lechermann, Jannik Gondolf, Ilya M. Eremin

AI总结:

针对高压 La$_3$Ni$_2$O$_7$,本文理论计算正常态与超导态磁激发,利用双层自旋响应的奇偶通道区分 $s_\pm$ 与 $d$ 波配对。

摘要:

受近期关于 La$_3$Ni$_2$O$_7$ 在压力下呈现高 $T_c$ 超导性报道的启发,我们从理论上分析了该化合物在正常态和超导态中的磁激发,这些激发可通过非弹性中子散射或 RIXS 测量。我们表明,自旋响应的双层结构能够以非常高效的方式阐明层间相互作用的作用以及 Cooper 配对的本质。特别是,我们通过比较自旋极化率在偶数和奇数通道中的相应响应,证明了近期提出的潜在 $s_\pm$ 能隙与 $d$ 波能隙之间的关键差异。我们表明,主要由层间驱动的成键-反键 $s_\pm$ Cooper 配对仅在 $X$ 点附近的奇数通道中产生单个大的自旋共振峰,而在 $d$ 波情形下,则预测奇数和偶数通道中均存在自旋共振。

英文摘要:

Motivated by the recent reports of high-$T_c$ superconductivity in La$_3$Ni$_2$O$_7$ under pressure, we analyzed theoretically the magnetic excitations in the normal and the superconducting state in this compound, which can be measured by inelastic neutron scattering or RIXS. We show that the bilayer structure of the spin response allows to elucidate the role of the interlayer interaction and the nature of the Cooper-pairing in a very efficient way. In particular, we demonstrate the key difference between the potential $s_\pm$ and $d$-wave gaps, proposed recently, by comparing the corresponding response in the even and odd channels of the spin susceptibility. We show that the mostly interlayer driven bonding-antibonding $s_\pm$ Cooper-pairing produces a single large spin resonance peak in the odd channel only near the $X$ point whereas spin resonances in both the odd and the even channel are predicted for the $d$-wave scenario.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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