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Superconductor01:24

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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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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
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Related Experiment Video

Updated: Jul 7, 2026

Fabrication and Characterization of Superconducting Resonators
10:26

Fabrication and Characterization of Superconducting Resonators

Published on: May 21, 2016

High-temperature superconducting resonators.

R C Taber1, J N Hollenhorst, L S Cutler

  • 1Hewlett-Packard Lab., Palo Alto, CA.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|January 1, 1992
PubMed
Summary
This summary is machine-generated.

High-temperature superconducting resonators show promise for low-noise oscillators. Fabricated YBaCuO/LaAlO resonators achieved high Q-factors, demonstrating potential for reduced frequency fluctuations.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Physics

Background:

  • High-temperature superconductors (high-T(c)) offer unique electromagnetic properties.
  • Low-noise oscillators are critical for advanced communication and sensing systems.
  • Resonator quality factor (Q) significantly impacts oscillator phase noise.

Purpose of the Study:

  • To investigate the potential of high-T(c) superconducting resonators for low-noise oscillator applications.
  • To analyze the contributions of various factors to oscillator noise.
  • To present preliminary measurements of a fabricated YBaCuO/LaAlO resonator.

Main Methods:

  • Fabrication of a Yttrium Barium Copper Oxide (YBaCuO) on Lanthanum Aluminate (LaAlO) superconducting resonator.
  • Measurement of resonator quality factor (Q) at different frequencies (6.9 GHz and 3.5 GHz).
  • Characterization of temperature sensitivity, power dependence, and residual phase noise.

Main Results:

  • Achieved Q-factors of 9x10^4 at 6.9 GHz and 7x10^4 at 3.5 GHz.
  • Demonstrated low temperature sensitivity and power dependence.
  • Measured an upper limit of -204 dB for the 1/f component of fractional-frequency fluctuations at 60 K.

Conclusions:

  • Preliminary results indicate high-T(c) superconducting resonators are excellent candidates for low-noise oscillators.
  • The fabricated YBaCuO/LaAlO resonator exhibits promising characteristics for noise reduction.
  • Further research can optimize these resonators for enhanced oscillator performance.