In situ x-ray absorption and photoelectron spectroscopy on epitaxial FexTe thin films with a wide range of Fe/Te compositions

IF 3.7 2区物理与天体物理 Q1 Physics and Astronomy Physical Review B Pub Date : 2024-12-26 DOI:10.1103/physrevb.110.245139

C. E. Liu, C. N. Wu, J. Falke, C. F. Chang, C.-Y. Kuo, S. Yang, J. Y. Juang, C. Koz, U. Schwarz, C. T. Chen, L. H. Tjeng, S. G. Altendorf

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Abstract

FexTe thin films were prepared on SrTiO3 (001) substrates by molecular beam epitaxy in a well-ordered epitaxial layer-by-layer fashion. The composition of the films was varied by adjusting the Te flux in a Te-limited growth regime. Changes in the electronic structure were systematically studied using x-ray absorption spectroscopy at the Fe L2,3 and Te M4,5 edges and x-ray photoelectron spectroscopy of core levels and valence band. We found that FeTe with optimized composition (Fe/Te ratio ≈ 1) provides the sharpest spectral features, indicating that Fe1.00Te can be synthesized as a thin film, although it is not possible in bulk.

Published by the American Physical Society

2024

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广泛Fe/Te成分外延fete薄膜的原位x射线吸收和光电子能谱

采用分子束外延的方法在SrTiO3（001）衬底上有序地逐层制备了fete薄膜。在Te限制生长状态下，通过调整Te通量来改变薄膜的组成。利用Fe L2,3和Te M4,5边的x射线吸收光谱和核心能级和价带的x射线光电子能谱系统地研究了电子结构的变化。我们发现经过优化的FeTe成分（Fe/Te比值≈1）提供了最清晰的光谱特征，这表明Fe1.00Te可以作为薄膜合成，尽管不可能批量合成。2024年由美国物理学会出版

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来源期刊

Physical Review B 物理-物理：凝聚态物理

CiteScore

6.70

自引率

32.40%

发文量

审稿时长

3.0 months

期刊介绍： Physical Review B (PRB) is the world’s largest dedicated physics journal, publishing approximately 100 new, high-quality papers each week. The most highly cited journal in condensed matter physics, PRB provides outstanding depth and breadth of coverage, combined with unrivaled context and background for ongoing research by scientists worldwide. PRB covers the full range of condensed matter, materials physics, and related subfields, including: -Structure and phase transitions -Ferroelectrics and multiferroics -Disordered systems and alloys -Magnetism -Superconductivity -Electronic structure, photonics, and metamaterials -Semiconductors and mesoscopic systems -Surfaces, nanoscience, and two-dimensional materials -Topological states of matter