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Magnetic monopole noise

Author

Listed:
  • Ritika Dusad

    (Cornell University)

  • Franziska K. K. Kirschner

    (University of Oxford)

  • Jesse C. Hoke

    (Cornell University
    Stanford University)

  • Benjamin R. Roberts

    (Cornell University)

  • Anna Eyal

    (Cornell University
    Technion – Israel Institute of Technology)

  • Felix Flicker

    (Clarendon Laboratory)

  • Graeme M. Luke

    (McMaster University
    McMaster University
    Canadian Institute for Advanced Research)

  • Stephen J. Blundell

    (University of Oxford)

  • J. C. Séamus Davis

    (Cornell University
    University of Oxford
    University College Cork)

Abstract

Magnetic monopoles1–3 are hypothetical elementary particles with quantized magnetic charge. In principle, a magnetic monopole can be detected by the quantized jump in magnetic flux that it generates upon passage through a superconducting quantum interference device (SQUID)4. Following the theoretical prediction that emergent magnetic monopoles should exist in several lanthanide pyrochlore magnetic insulators5,6, including Dy2Ti2O7, the SQUID technique has been proposed for their direct detection6. However, this approach has been hindered by the high number density and the generation–recombination fluctuations expected of such thermally generated monopoles. Recently, theoretical advances have enabled the prediction of the spectral density of magnetic-flux noise from monopole generation–recombination fluctuations in these materials7,8. Here we report the development of a SQUID-based flux noise spectrometer and measurements of the frequency and temperature dependence of magnetic-flux noise generated by Dy2Ti2O7 crystals. We detect almost all of the features of magnetic-flux noise predicted for magnetic monopole plasmas7,8, including the existence of intense magnetization noise and its characteristic frequency and temperature dependence. Moreover, comparisons of simulated and measured correlation functions of the magnetic-flux noise indicate that the motions of magnetic charges are strongly correlated. Intriguingly, because the generation–recombination time constant for Dy2Ti2O7 is in the millisecond range, magnetic monopole flux noise amplified by SQUID is audible to humans.

Suggested Citation

  • Ritika Dusad & Franziska K. K. Kirschner & Jesse C. Hoke & Benjamin R. Roberts & Anna Eyal & Felix Flicker & Graeme M. Luke & Stephen J. Blundell & J. C. Séamus Davis, 2019. "Magnetic monopole noise," Nature, Nature, vol. 571(7764), pages 234-239, July.
    • Handle: RePEc:nat:nature:v:571:y:2019:i:7764:d:10.1038_s41586-019-1358-1
    DOI: 10.1038/s41586-019-1358-1
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    Cited by:

    1. Han Zhang & Chengkun Xing & Kyle Noordhoek & Zhaoyu Liu & Tianhao Zhao & Lukas Horák & Qing Huang & Lin Hao & Junyi Yang & Shashi Pandey & Elbio Dagotto & Zhigang Jiang & Jiun-Haw Chu & Yan Xin & Eun , 2023. "Anomalous magnetoresistance by breaking ice rule in Bi2Ir2O7/Dy2Ti2O7 heterostructure," Nature Communications, Nature, vol. 14(1), pages 1-7, December.

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