Quenched pair breaking by interlayer correlations as a key to superconductivity in La$_3$Ni$_2$O$_7$
Quenched pair breaking by interlayer correlations as a key to superconductivity in La$_3$Ni$_2$O$_7$
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层间相关性淬火对断裂是 La$_3$Ni$_2$O$_7$ 超导性的关键
DOI：
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发表时间：
2023
期刊：
影响因子：
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通讯作者：
T. Wehling
中科院分区：
文献类型：
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作者：
S. Ryee;Niklas Witt;T. Wehling
最近在高压下发现的超导体La 3 Ni 2 O 7的超导性为高Tc超导开辟了一条新的途径。这种材料实现了双层正方形晶格模型，其特征在于与许多非常规超导体不同的强层间杂化。在这方面的一个关键问题是如何驱动的层间杂化的电子关联影响的低能电子结构和随之而来的超导性。在这里，我们证明了使用集群动力学平均场理论，层间电子关联（IEC）诱导的Lifshitz转变，导致费米表面拓扑结构的变化。通过求解适当的间隙方程，我们进一步表明，领先的配对不稳定性，$s \pm$-波，增强的IEC。潜在的机制是一个强铁磁通道的淬火，导致由IEC驱动的Lifshitz转变。基于这一图象，我们提供了为什么超导性只在高压下出现的一个可能的原因。
The recent discovery of superconductivity in La$_3$Ni$_2$O$_7$ with $T_\mathrm{c} \simeq 80~\mathrm{K}$ under high pressure opens up a new route to high-$T_\mathrm{c}$ superconductivity. This material realizes a bilayer square lattice model featuring a strong interlayer hybridization unlike many unconventional superconductors. A key question in this regard concerns how electronic correlations driven by the interlayer hybridization affect the low-energy electronic structure and the concomitant superconductivity. Here, we demonstrate using a cluster dynamical mean-field theory that the interlayer electronic correlations (IECs) induce a Lifshitz transition resulting in a change of Fermi surface topology. By solving an appropriate gap equation, we further show that the leading pairing instability, $s \pm$-wave, is enhanced by the IECs. The underlying mechanism is the quenching of a strong ferromagnetic channel, resulting from the Lifshitz transition driven by the IECs. Based on this picture, we provide a possible reason of why superconductivity emerges only under high pressure.
影响因子：
8.6
作者：
H. Sakakibara;Naoya Kitamine;M. Ochi;K. Kuroki
通讯作者：
H. Sakakibara;Naoya Kitamine;M. Ochi;K. Kuroki
新型稀土一氧化物：基本性质和电子态
DOI：
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发表时间：
2020
期刊：
影响因子：
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作者：
K. Kaminaga;H. Shimizu;N. Abe;T. Yamamoto;D. Saito;D. Oka;D. Shiga;M. Kitamura;H. Horiba;H. Kumigashira;T. Fukumura
通讯作者：
T. Fukumura