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Wafer-Scale MgB2 Superconducting Devices.

Changsub Kim1, Christina Bell1,2, Jake M Evans3

  • 1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, United States.

ACS Nano
|September 24, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed ultrasmooth magnesium diboride (MgB2) thin films for advanced superconducting electronics. These films enable high-performance quantum circuits and devices operating at higher temperatures and frequencies.

Keywords:
MgB2high frequencyhigh-Tckinetic inductancesuperconducting devicesthin filmswafer-scale

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Superconductivity

Background:

  • Superconducting devices utilize materials like aluminum and niobium compounds.
  • Magnesium diboride (MgB2) offers a high transition temperature (39 K) for elevated temperature applications.
  • Synthesizing wafer-scale MgB2 thin films has been a significant challenge.

Purpose of the Study:

  • To develop wafer-scale, ultrasmooth thin films of magnesium diboride (MgB2).
  • To demonstrate the potential of these MgB2 films in fabricating advanced superconducting devices.
  • To overcome limitations in current superconducting thin-film material choices.

Main Methods:

  • Fabrication of ultrasmooth (<0.5 nm RMS roughness) and uniform MgB2 thin films (<100 nm) over 100 mm diameter wafers.
  • Characterization of superconducting properties of the fabricated MgB2 films.
  • Fabrication and testing of prototype superconducting devices using the developed MgB2 films.

Main Results:

  • Achieved ultrasmooth and uniform MgB2 thin films suitable for large-scale fabrication.
  • Demonstrated prototype devices with an internal quality factor >10^4 at 4.5 K.
  • Observed high tunable kinetic inductance (tens of pH/sq) in 40 nm thick MgB2 films.

Conclusions:

  • The developed MgB2 thin films are a promising material for next-generation superconducting electronics.
  • This advancement facilitates the development of high-frequency and elevated-temperature superconducting quantum circuits.
  • Enables new possibilities for superconducting devices in quantum computing and THz applications.