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arXiv 2202.12952cond-mat.supr-concond-mat.mtrl-scicond-mat.str-el
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拓扑约束下铜氧化物的超导电性

Superconductivity in cuprates governed by topological constraints

Yves Noat, Alain Mauger, William Sacks

摘要:

铜氧化物$T_c$圆顶的显著普遍性表明了一个非常基本的统一原则。此外,超导能隙是已知的持久以上$T_c$在所有的铜酸盐的赝隙阶段。因此,与BCS相反,间隙不能是跃迁的序参量。在这项工作中,我们表明,无论是$T_c$ -圆顶和赝间隙线$T^*(p)$产生从一个独特的和可识别的原则:本地化的“对”的反铁磁正方形晶格的相互作用。对这种预形成的对的拓扑约束引起$T_c$圆顶和对能{ \it同时}。它也为相图的临界掺杂点提供了一个自然的解释。该模型完全匹配的$T^*$和$T_c$的实验线,只有一个可调参数。

英文摘要:

The remarkable universality of the cuprate $T_c$ dome suggests a very fundamental unifying principle. Moreover, the superconducting gap is known to persist above $T_c$ in the pseudogap phase of all cuprates. So, contrary to BCS, the gap cannot be the order parameter of the transition. In this work, we show that both the $T_c$-dome and the pseudogap line $T^*(p)$ arise from a unique and identifiable principle: the interaction of localized `pairons' on an antiferromagnetic square lattice. The topological constraints on such preformed pairons give rise to both the $T_c$ dome and the pairing energy {\it simultaneously}. It also provides a natural explanation for the critical doping points of the phase diagram. The model matches perfectly both the $T^*$ and $T_c$ experimental lines, with only one adjustable parameter.

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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