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Magnetic monopole noise.

Ritika Dusad1, Franziska K K Kirschner2, Jesse C Hoke1,3

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Summary
This summary is machine-generated.

Researchers detected magnetic monopoles, hypothetical particles, using a superconducting quantum interference device (SQUID) spectrometer. This breakthrough reveals intense magnetization noise and correlated charge motion in Dy$_{2}$Ti$_{2}$O$_{7}$ crystals.

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Area of Science:

  • Condensed Matter Physics
  • Particle Physics
  • Quantum Magnetism

Background:

  • Magnetic monopoles are hypothetical particles with quantized magnetic charge.
  • Emergent magnetic monopoles are theoretically predicted in lanthanide pyrochlore magnetic insulators like Dy$_{2}$Ti$_{2}$O$_{7}$.

Purpose of the Study:

  • To develop a SQUID-based spectrometer for detecting magnetic monopoles.
  • To measure the magnetic-flux noise generated by Dy$_{2}$Ti$_{2}$O$_{7}$ crystals.

Main Methods:

  • Development of a SQUID-based flux noise spectrometer.
  • Measurement of magnetic-flux noise frequency and temperature dependence in Dy$_{2}$Ti$_{2}$O$_{7}$.
  • Comparison of simulated and measured magnetic-flux noise correlation functions.

Main Results:

  • Detection of magnetic-flux noise features predicted for magnetic monopole plasmas.
  • Observation of intense magnetization noise with characteristic frequency and temperature dependence.
  • Evidence for strongly correlated motions of magnetic charges.

Conclusions:

  • The study provides experimental evidence supporting the existence of emergent magnetic monopoles in Dy$_{2}$Ti$_{2}$O$_{7}$.
  • The findings validate theoretical predictions regarding magnetic monopole plasma behavior.
  • The millisecond generation-recombination time constant makes the amplified noise audible.