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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Heavy fermion compounds exhibit complex magnetic behaviors.
  • Spin density waves (SDWs) are fundamental to understanding magnetism in certain materials.
  • CeAuSb2 is a tetragonal heavy fermion system with potential for novel magnetic phases.

Purpose of the Study:

  • To investigate the magnetic phase transitions in CeAuSb2 under an applied magnetic field.
  • To characterize the evolution of the spin density wave structure.
  • To understand the field-driven transition from single-q to multi-q SDW states.

Main Methods:

  • Single-crystal X-ray diffraction to probe magnetic structure.
  • Magnetization measurements to determine magnetic ordering and transitions.
  • Analysis of magnetic field-induced changes in spin density wave vectors and amplitudes.

Main Results:

  • Discovery of a field-driven transition from a single-q to a multi-q SDW in CeAuSb2.
  • Identification of a striped magnetic texture below 2.78 T, evidenced by harmonics at 2q1.
  • Observation of coupled harmonics at q1+q2 above 2.78 T, indicating a transition to a different multi-q state.
  • Magnetization approaches saturation at 1.64 μB/Ce around 7 T.

Conclusions:

  • CeAuSb2 exhibits a complex, field-tuned magnetic phase diagram.
  • The transition from single-q to multi-q SDW is driven by external magnetic fields.
  • Understanding these transitions provides insights into the interplay between electronic correlations and magnetism in heavy fermion systems.