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Evolving Devil's Staircase Magnetization from Tunable Charge Density Waves in Nonsymmorphic Dirac Semimetals.

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Advanced Materials (Deerfield Beach, Fla.)
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Summary

Researchers discovered that altering electron filling in CeSbTe, a magnetic topological semimetal, creates tunable charge density waves (CDWs) and novel magnetic states. This leads to a robust Dirac semimetal with rich magnetism.

Keywords:
antiferromagnetic dirac semimetalscharge density wavesquantized magnetization plateausspin waves

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Magnetic topological semimetals often have complex band structures.
  • Square-net materials offer cleaner, linearly dispersing bands for topological applications.

Purpose of the Study:

  • To investigate the tunability of topological phases in the square-net material CeSbTe.
  • To explore the impact of electron filling on the material's electronic and magnetic properties.

Main Methods:

  • Experimental synthesis and characterization of CeSbTe.
  • Investigating structural distortions and charge density wave (CDW) formation.
  • Measuring magnetic properties and magnetization plateaus.

Main Results:

  • Electron filling changes induce structural distortions and CDW formation.
  • A complex "Devil's staircase" magnetic ground state emerges with continuous wave-vector evolution.
  • Fractionally quantized magnetization plateaus indicate coupling between CDW and spin excitations.

Conclusions:

  • CeSbTe exhibits tunable topological phases driven by electron filling and CDW formation.
  • The CDW stabilizes an idealized nonsymmorphic Dirac semimetal.
  • This work provides access to topological systems with intricate magnetism.