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Researchers developed vanadium-based superconducting quantum interference proximity transistors (SQUIPTs). These devices offer enhanced flux sensitivity and operate at higher temperatures, paving the way for advanced nanoscale applications.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Electronics
  • Materials Science

Background:

  • Superconducting Quantum Interference Proximity Transistors (SQUIPTs) are crucial for sensitive measurements.
  • Previous SQUIPT designs had limitations in operating temperature and performance.

Purpose of the Study:

  • To fabricate and characterize novel SQUIPTs using vanadium (V) in the superconducting loop.
  • To improve the operating temperature and flux sensitivity of SQUIPT devices.
  • To explore the potential of higher-gap superconductors for nanoscale applications.

Main Methods:

  • Fabrication of fully superconducting quantum interference proximity transistors (SQUIPTs) incorporating vanadium.
  • Characterization of device performance, including flux-to-voltage and flux-to-current transfer functions.
  • Theoretical modeling of V-based SQUIPT features.

Main Results:

  • Achieved high flux-to-voltage transfer functions (up to 0.52 mV/Φ₀) and flux-to-current transfer functions (above 12 nA/Φ₀).
  • Demonstrated a flux sensitivity of approximately 2.6 μΦ₀/(Hz)¹/² under fixed voltage bias.
  • Extended the operating temperature to 2 K, a 70% improvement over previous designs.

Conclusions:

  • Vanadium-based SQUIPTs exhibit superior performance and higher operating temperatures.
  • These findings enable the development of ultra-sensitive nanoscale devices using higher-gap superconductors.
  • The improved SQUIPTs are suitable for applications operating well above 1 K.