Inferior Interfacial Superconductivity in 1 UC FeSe/SrVO3/SrTiO3 with Screened Interfacial Electron–Phonon Coupling

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Nano Letters Pub Date : 2024-07-05 DOI:10.1021/acs.nanolett.4c01612

Nan Guo, Xiaoyang Chen, Tianlun Yu, Yu Fan, Qinghua Zhang, Minyinan Lei, Xiaofeng Xu, Xuetao Zhu, Jiandong Guo, Lin Gu, Haichao Xu*, Rui Peng* and Donglai Feng*,

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Abstract

Single-unit cell (1 UC) FeSe interfaced with TiO_x or FeO_x exhibits significantly enhanced superconductivity compared to that of bulk FeSe, with interfacial electron–phonon coupling (EPC) playing a crucial role. However, the reduced dimensionality in 1 UC FeSe, which may drive superconducting fluctuations, complicates our understanding of the enhancement mechanisms. We construct a new superconducting interface, 1 UC FeSe/SrVO₃/SrTiO₃. Here, the itinerant electrons of highly metallic SrVO₃ films can screen all high-energy Fuchs–Kliewer phonons, including those of SrTiO₃, making it the first FeSe/oxide system with screened interfacial EPC while maintaining the 1 UC FeSe thickness. Despite comparable doping levels, the heavily electron-doped 1 UC FeSe/SrVO₃ exhibits a pairing temperature (T_g ∼ 48 K) lower than those of FeSe/SrTiO₃ and FeSe/LaFeO₃. Our findings disentangle the contributions of interfacial EPC from dimensionality in terms of enhancing T_g in FeSe/oxide interfaces, underscoring the critical importance of interfacial EPC. This FeSe/VO_x interface also provides a platform for studying interfacial superconductivity.

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1 UC FeSe/SrVO3/SrTiO3 中具有屏蔽界面电子-虹子耦合的劣质界面超导性。

与块状 FeSe 相比，与 TiOx 或 FeOx 相连接的单单元单元（1 UC）FeSe 具有显著增强的超导性，其中界面电子-声子耦合（EPC）发挥了关键作用。然而，1 UC FeSe 的维度降低可能会驱动超导波动，这使得我们对增强机制的理解变得更加复杂。我们构建了一个新的超导界面--1 UC FeSe/SrVO3/SrTiO3。在这里，高金属 SrVO3 薄膜的巡回电子可以屏蔽所有高能 Fuchs-Kliewer 声子，包括 SrTiO3 的声子，使其成为第一个在保持 1 UC FeSe 厚度的同时具有屏蔽界面 EPC 的 FeSe/氧化物系统。尽管掺杂水平相当，但重电子掺杂的 1 UC FeSe/SrVO3 的配对温度（Tg ∼ 48 K）低于 FeSe/SrTiO3 和 FeSe/LaFeO3 的配对温度。我们的研究结果厘清了在提高 FeSe/氧化物界面的 Tg 方面界面 EPC 与尺寸的贡献，强调了界面 EPC 的至关重要性。这种 FeSe/VOx 界面还为研究界面超导性提供了一个平台。

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

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.