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Related Concept Videos

Superconductor01:24

Superconductor

A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...

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Related Experiment Video

Updated: Jun 1, 2026

Fabrication and Characterization of Superconducting Resonators
10:26

Fabrication and Characterization of Superconducting Resonators

Published on: May 21, 2016

Note: Radio frequency surface impedance characterization system for superconducting samples at 7.5 GHz.

B P Xiao1, C E Reece, H L Phillips

  • 1Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.

The Review of Scientific Instruments
|June 7, 2011
PubMed
Summary
This summary is machine-generated.

A new radio frequency (RF) surface impedance characterization (SIC) system measures superconducting materials using a novel cavity. This tool provides direct calorimetric measurements on niobium samples at low temperatures and high RF fields.

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Area of Science:

  • Superconducting materials science
  • Radio frequency (RF) engineering
  • Low-temperature physics

Background:

  • Accurate characterization of radio frequency (RF) surface impedance is crucial for superconducting devices.
  • Existing methods may have limitations in sensitivity, sample size, or operating conditions.
  • Development of novel measurement systems is needed for advanced superconducting material research.

Purpose of the Study:

  • To develop and present a novel radio frequency (RF) surface impedance characterization (SIC) system.
  • To enable direct calorimetric RF surface impedance measurements on flat superconducting material samples.
  • To demonstrate the system's utility with initial measurements on a bulk niobium sample.

Main Methods:

  • Utilized a novel sapphire-loaded niobium cavity operating at 7.5 GHz.
  • Employed direct calorimetric measurement techniques.
  • Tested on 5 cm diameter disk samples, measuring the central 0.8 cm² area under specific temperature and RF field conditions.

Main Results:

  • Successfully developed and operated the RF surface impedance characterization (SIC) system.
  • Demonstrated capability for direct calorimetric measurements on bulk niobium.
  • Measurements were performed at temperatures ranging from 2 to 20 K and RF magnetic fields up to 14 mT.

Conclusions:

  • The novel sapphire-loaded niobium cavity system is a viable tool for RF surface impedance characterization.
  • The system provides direct calorimetric measurements, offering valuable data for superconducting materials.
  • Initial results on niobium validate the system's performance and potential for future research.