Observation of magnetic monopoles in spin ice

Hiroaki Kadowaki, Naohiro Doi, Yuji Aoki, Yoshikazu Tabata, Taku J. Sato, Jeffrey W. Lynn, Kazuyuki Matsuhira, Zenji Hiroi

Research output: Contribution to journalArticlepeer-review

140 Citations (Scopus)


Excitations from a strongly frustrated system, the kagomé ice state of the spin ice Dy2Ti2O7 under magnetic fields along a [111] direction, have been studied. They are theoretically proposed to be regarded as magnetic monopoles. Neutron scattering measurements of spin correlations show that close to the critical point the monopoles are fluctuating between high- and low-density states, supporting that the magnetic Coulomb force acts between them. Specific heat measurements show that monopole-pair creation obeys an Arrhenius law, indicating that the density of monopoles can be controlled by temperature and magnetic field.

Original languageEnglish
Article number103706-1
JournalJournal of the Physical Society of Japan
Issue number10
Publication statusPublished - 2009


  • Kagomé ice
  • Magnetic monopole
  • Neutron scattering
  • Specific heat
  • Spin ice


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