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Updated: Feb 19, 2026

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Orbital-dependent charge dynamics in MnP revealed by optical study.

P Zheng1, Y J Xu2,3, W Wu2,3

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|October 29, 2017
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Summary

Charge dynamics in manganese phosphide (MnP) reveal distinct carrier behaviors. Flat band carriers gap in the helimagnetic phase, while 3D carriers dominate transport, impacting unconventional superconductivity.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Quantum materials

Background:

  • Unconventional superconductivity frequently arises near magnetic ordering.
  • Low-energy charge dynamics are key to understanding superconductivity formation.
  • Manganese phosphide (MnP) is a material exhibiting complex magnetic and electronic properties.

Purpose of the Study:

  • To investigate the low-energy charge dynamics in high-quality MnP single crystals.
  • To elucidate the relationship between charge carrier behavior and magnetic transitions.
  • To understand the influence of orbital-dependent dynamics on superconductivity in MnP.

Main Methods:

  • Unpolarized and polarized optical conductivity measurements.
  • First-principles calculations.
  • Analysis of charge carrier lifetimes and Fermi surface topology.

Main Results:

  • Two types of charge carriers with significantly different lifetimes were identified.
  • Short-lifetime carriers with flat Fermi sheets become gapped in the helimagnetic phase.
  • Long-lifetime, anisotropic 3D carriers are largely unaffected by magnetic transitions and dominate transport.

Conclusions:

  • The observed orbital-dependent charge dynamics in MnP stem from its unique crystal structure.
  • These dynamics, particularly the gapping of flat band carriers, are crucial for understanding the interplay between helimagnetism and unconventional superconductivity.
  • Further research into MnP at high pressures may reveal insights into pressure-induced superconductivity.