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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Electrodynamics

Background:

  • Topological quantum states offer unique electrodynamics and electronic properties.
  • Emergent electromagnetic fields arise from interactions between topological spin structures and electrons.
  • Exploiting these phenomena for heat-electricity conversion remains largely unexplored.

Purpose of the Study:

  • To investigate the potential of topological spin textures for thermoelectric applications.
  • To explore the influence of magnetic fields on thermopower in materials hosting topological spin textures.
  • To elucidate the mechanisms behind enhanced thermopower in such systems.

Main Methods:

  • Synthesis and characterization of MnGe hosting topological spin textures.
  • Quantitative investigation of electronic structures and transport properties.
  • Magnetic field-dependent thermopower measurements, including high-field studies.

Main Results:

  • An unusually enhanced thermopower was observed in MnGe upon application of a magnetic field.
  • A large magneto-thermopower effect was linked to the energy-dependent charge-transport lifetime.
  • Unconventional carrier scattering via emergent magnetic field dynamics was identified as a key factor.
  • Residual magnetic fluctuations even in ferromagnetic regions contribute to the field-enhanced thermopower.

Conclusions:

  • The study demonstrates a significant magneto-thermopower effect in MnGe with topological spin textures.
  • Emergent magnetic fields and their dynamics play a crucial role in this enhanced thermoelectric response.
  • This work opens avenues for developing thermoelectric functionalities in topological magnets.