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

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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Abstract

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