薄膜厚度对LaSi2(00l)/Si（100）薄膜超导性的影响

IF 2.8 3区物理与天体物理 Q2 PHYSICS, CONDENSED MATTER

Physica B-condensed Matter Pub Date : 2024-11-30 DOI:10.1016/j.physb.2024.416785

Jia Han , Chuanyi Wu , Yangzhou Wang , Jin Wang , Baojuan Kang , Shixun Cao , Jincang Zhang , Fei Chen

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引用次数: 0

摘要

本文采用分子束外延（MBE）法制备了不同厚度的LaSi2(00l)/Si（100）单晶薄膜，通过电输运和磁性能测试研究了薄膜的超导性能。S50（沉积厚度约为50 nm的样品）表现出最高的超导转变温度（Tc）为2.62 K，高于大块LaSi2。Tc随膜厚的变化在8%以内。上临界场（Hc2）随膜厚的减小而增大。特别是对于沉积厚度在10 nm左右的最薄的LaSi2薄膜，由于界面效应的缺陷和紊乱，Hc2急剧增加，通量跳变活性消失。我们的工作完成了LaSi2薄膜的超导性质，这有助于理解薄膜厚度对LaSi2体系超导性的影响和调制。

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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Effects of film thickness on the superconductivity of LaSi2(00l)/Si(100) films

In this paper, we studied the superconducting properties of the LaSi₂(00l)/Si(100) single-crystalline thin films prepared by the molecular beam epitaxy (MBE) method with different thicknesses via electro-transport and magnetic properties measurements. The S50 (sample with deposition thickness around 50 nm) exhibits the highest superconducting transition temperature (T_c) of 2.62 K, which is higher than that of the bulk LaSi₂. The variation of T_c with film thickness is within 8 %. In addition, the upper critical field (H_c2) increases with reducing film thickness. Especially for the thinnest LaSi₂ film with deposition thickness around 10 nm, the H_c2 shows a sharp increase and the flux jump activity disappears, which is due to the defects and disorders from the interfacial effect. Our work completes the superconducting properties of LaSi₂ films, which helps to understand the influence and modulation of film thickness on superconductivity in LaSi₂ system.

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来源期刊

Physica B-condensed Matter 物理-物理：凝聚态物理

CiteScore

4.90

自引率

7.10%

发文量

703

审稿时长

44 days

期刊介绍： Physica B: Condensed Matter comprises all condensed matter and material physics that involve theoretical, computational and experimental work. Papers should contain further developments and a proper discussion on the physics of experimental or theoretical results in one of the following areas: -Magnetism -Materials physics -Nanostructures and nanomaterials -Optics and optical materials -Quantum materials -Semiconductors -Strongly correlated systems -Superconductivity -Surfaces and interfaces