Atomic-Site-Dependent Pairing Gap in Monolayer FeSe/SrTiO3(001)–(√13 × √13)

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2024-06-25 DOI:10.1021/acs.nanolett.4c02627

Cui Ding, Zhongxu Wei, Wenfeng Dong, Hai Feng, Mingxia Shi, Lili Wang*, Jin-Feng Jia* and Qi-Kun Xue*,

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Abstract

The interfacial FeSe/TiO_2−δ coupling induces high-temperature superconductivity in monolayer FeSe films. Using cryogenic atomically resolved scanning tunneling microscopy/spectroscopy, we obtained atomic-site dependent surface density of states, work function, and the pairing gap in the monolayer FeSe on the SrTiO₃(001)–(√13 × √13)–R33.7° surface. Our results disclosed the out-of-plane Se–Fe–Se triple layer gradient variation, switched DOS for Fe sites on and off TiO_5□, and inequivalent Fe sublattices, which gives global spatial modulation of pairing gap contaminants with the (√13 × √13) pattern. Moreover, the coherent lattice coupling induces strong inversion asymmetry and in-plane anisotropy in the monolayer FeSe, which is demonstrated to correlate with the particle–hole asymmetry in coherence peaks. These results disclose delicate atomic-scale correlations between pairing and lattice-electronic coupling in the Bardeen–Cooper–Schrieffer to Bose–Einstein condensation crossover regime, providing insights into understanding the pairing mechanism of multiorbital superconductivity.

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单层 FeSe/SrTiO3(001)-(√13 × √13) 中原子-位点相关的配对间隙

FeSe/TiO2-δ界面耦合诱导了单层FeSe薄膜的高温超导性。利用低温原子分辨扫描隧道显微镜/光谱仪，我们获得了SrTiO3(001)-(√13 × √13)-R33.7°表面上单层FeSe的原子位依赖表面态密度、功函数和配对间隙。我们的研究结果揭示了面外硒-铁-硒三层梯度变化、TiO5□上和TiO5□外铁位点的DOS切换以及不等价的铁亚晶格，这使得配对间隙污染物与（√13 × √13）模式产生了全局空间调制。此外，相干晶格耦合在单层硒化铁中引起了强烈的反转不对称和面内各向异性，这被证明与相干峰中的粒子-空穴不对称相关。这些结果揭示了在巴丁-库珀-施里弗到玻色-爱因斯坦凝聚交叉机制中配对与晶格电子耦合之间微妙的原子尺度相关性，为理解多轨道超导的配对机制提供了启示。

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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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

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