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Fragmentation in spin ice from magnetic charge injection.

E Lefrançois1,2,3, V Cathelin2, E Lhotel2

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Researchers created a monopole crystal in spin ice using a staggered magnetic field. This new state of matter, magnetic fragmentation, shows ordered and fluctuating magnetic moments, enabling tunable behaviors.

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Area of Science:

  • Condensed Matter Physics
  • Magnetism
  • Materials Science

Background:

  • Condensed matter systems exhibit complex phenomena, including novel states of matter like Kitaev spin liquids, skyrmion phases, and spin ices.
  • Spin ices are known for exotic excitations, such as magnetic monopoles (magnetic charges).
  • Understanding and controlling these exotic excitations is crucial for advancing fundamental physics and material applications.

Purpose of the Study:

  • To propose and demonstrate a novel mechanism for injecting magnetic monopoles into spin ice systems at equilibrium.
  • To investigate the stabilization of a monopole crystal and its associated phenomenon of magnetic fragmentation.
  • To explore the potential for tunable field-induced and dynamical behaviors in this newly discovered magnetic state.

Main Methods:

  • Theoretical modeling to propose a mechanism for monopole injection using a staggered magnetic field.
  • Experimental demonstration in the Ho2Ir2O7 pyrochlore iridate material.
  • Characterization of the resulting monopole crystal and its magnetic fragmentation.

Main Results:

  • Successfully stabilized a monopole crystal in Ho2Ir2O7 using a staggered magnetic field.
  • Observed magnetic fragmentation, where the magnetic moment splits into ordered and fluctuating components.
  • Confirmed the theoretical predictions for monopole injection and crystal formation.

Conclusions:

  • A staggered magnetic field can stabilize a monopole crystal in spin ice, leading to magnetic fragmentation.
  • This fragmented state exhibits distinct excitations compared to conventional spin ices.
  • The findings open avenues for controlling field-induced and dynamical magnetic behaviors in novel states of matter.