硅铁基超导体家族的晶格动力学

IF 1.8 4区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

EPL Pub Date : 2024-05-27 DOI:10.1209/0295-5075/ad3b37

S. Layek, M. F. Hansen, J.-B. Vaney, P. Toulemonde, S. Tencé, P. Boullay, A. Cano and M.-A. Méasson

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引用次数: 0

摘要

通过偏振拉曼光谱和第一原理计算，以及用于结构分析的 X 射线和先进电子衍射技术，研究了超导材料 LaFeSiH 和 LaFeSiO1-δ 及其金属间前体 LaFeSi 的晶格动力学。我们发现，以铁为主的拉曼活性模式反映了这些硅化物与锑化物相比在化学上的特殊性，铁硅层与间隔层之间的结构耦合增强，这可能与后者的离子特性与共价特性有关。此外，我们还发现一些拉曼活性模式的电子-声子耦合增强。除此之外，我们的研究还揭示了 LaFeSiH 中有趣的铁基拉曼特征和微妙的结构，表明这种超导体在形式上可能是非中心对称的。

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Lattice dynamics in the FeSi-based family of superconductors

The lattice dynamics of the superconducting materials LaFeSiH and LaFeSiO1-δ as well as their intermetallic precursor LaFeSi are investigated by polarized Raman spectroscopy and first-principles calculations, together with X-ray and advanced electron diffraction techniques for their structural analysis. We find that the Fe-dominated Raman-active modes reflect the chemical peculiarities of these silicides compared to their pnictide counterparts, with enhanced structural couplings between the FeSi layer and the spacer that can be related to the ionic vs. covalent character of the latter. In addition, we find signatures of enhanced electron-phonon coupling for some of the Raman-active modes. Beyond that, our study reveals intriguing Fe-based Raman features as well as structural subtleties in LaFeSiH suggesting that this superconductor may formally be non-centrosymmetric.

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来源期刊

EPL 物理-物理：综合

CiteScore

3.30

自引率

5.60%

发文量

332

审稿时长

1.9 months

期刊介绍： General physics – physics of elementary particles and fields – nuclear physics – atomic, molecular and optical physics – classical areas of phenomenology – physics of gases, plasmas and electrical discharges – condensed matter – cross-disciplinary physics and related areas of science and technology. Letters submitted to EPL should contain new results, ideas, concepts, experimental methods, theoretical treatments, including those with application potential and be of broad interest and importance to one or several sections of the physics community. The presentation should satisfy the specialist, yet remain understandable to the researchers in other fields through a suitable, clearly written introduction and conclusion (if appropriate). EPL also publishes Comments on Letters previously published in the Journal.