MgB2 ultrathin films fabricated by hybrid physical chemical vapor deposition and ion milling

Matthäus A Wolak,Teng Tan,Narendra Acharya,Dan Cunnane,X X Xi,Namhoon Lee,Andrew C Lang,Mitra Taheri,Boris S Karasik

doi:10.1063/1.4961635

Matthäus A Wolak, Teng Tan + Show 7 more

Open Access

https://doi.org/10.1063/1.4961635

Copy DOI

Abstract

In this letter, we report on the structural and transport measurements of ultrathin MgB2 films grown by hybrid physical-chemical vapor deposition followed by low incident angle Ar ion milling. The ultrathin films as thin as 1.8 nm, or 6 unit cells, exhibit excellent superconducting properties such as high critical temperature (Tc) and high critical current density (Jc). The results show the great potential of these ultrathin films for superconducting devices and present a possibility to explore superconductivity in MgB2 at the 2D limit.

Highlights

We report on the structural and transport measurements of ultrathin MgB2 films grown by hybrid physical-chemical vapor deposition followed by low incident angle Ar ion milling
MgB2 films grown by methods such as the co-evaporation process[13] and molecular beam epitaxy[14,15,16,17,18] suffer from a significant drop in critical temperature (Tc) when the film thickness decreases
Ultrathin films grown by hybrid physical-chemical vapor deposition (HPCVD) exhibit superior quality[19,20] and display a Tc of up to 36 K for 10 nm thick films.[21]

Summary

Introduction

We report on the structural and transport measurements of ultrathin MgB2 films grown by hybrid physical-chemical vapor deposition followed by low incident angle Ar ion milling. MgB2 ultrathin films fabricated by hybrid physical chemical vapor deposition and ion milling

Results

Conclusion