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Physical properties of EuPd2As2 single crystals.

V K Anand1, D C Johnston

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Summary

EuPd2As2 single crystals exhibit complex antiferromagnetic ordering with two distinct magnetic transitions. A spin reorientation occurs below 5.5 K, and a superzone energy gap forms, impacting electrical resistivity.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • EuPd2As2 is a metallic compound crystallizing in the ThCr2Si2-type structure.
  • Understanding the magnetic properties of rare-earth intermetallic compounds is crucial for developing new magnetic materials.

Purpose of the Study:

  • To investigate the physical properties of self-flux grown EuPd2As2 single crystals.
  • To characterize the magnetic ordering and phase transitions in EuPd2As2.

Main Methods:

  • Magnetization (M), magnetic susceptibility (χ), specific heat (Cp), and electrical resistivity (ρ) measurements.
  • Temperature (T) and magnetic field (H) dependent studies.
  • Powder x-ray diffraction for crystal structure determination.

Main Results:

  • EuPd2As2 exhibits metallic behavior and long-range antiferromagnetic (AFM) ordering with Eu(+2) moments (S = 7/2, g = 2).
  • Two magnetic transitions observed at TN1 = 11.0 K and TN2 = 5.5 K for H∥c, indicating a spin reorientation transition.
  • A planar noncollinear AFM structure exists between TN1 and TN2, transitioning to a spin-canted structure below TN2.
  • Superzone energy gap formation observed below TN1, affecting electrical resistivity.

Conclusions:

  • EuPd2As2 displays complex magnetic behavior driven by AFM ordering and spin reorientation.
  • The formation of a superzone energy gap influences the electronic properties at low temperatures.
  • Further research into critical fields and anisotropic magnetic structures is warranted.