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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Color in Coordination Complexes
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Ising-type Magnetic Anisotropy in CePd2As2.

M O Ajeesh1, T Shang2, W B Jiang2

  • 1Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187, Dresden, Germany. ajeesh@cpfs.mpg.de.

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We studied CePd2As2, finding strong Ising-type magnetic anisotropy due to crystalline electric fields. This material exhibits a clear spin-flip transition in an antiferromagnetic state, confirming localized 4f-electron behavior.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Understanding anisotropic magnetic properties is crucial for novel electronic devices.
  • Cerium-based intermetallic compounds are known for complex magnetic behaviors.

Purpose of the Study:

  • To investigate the anisotropic magnetic properties of CePd2As2 single crystals.
  • To elucidate the nature of magnetic ordering and anisotropy in this material.

Main Methods:

  • Magnetic, thermal, and electrical transport measurements.
  • X-ray diffraction for structural confirmation.
  • Crystalline Electric Field (CEF) analysis.

Main Results:

  • CePd2As2 exhibits a strong Ising-type magneto-crystalline anisotropy.
  • A uniaxial antiferromagnetic transition was observed at 14.7 K with the c-axis as the easy axis.
  • A metamagnetic spin-flip transition occurred at 0.95 T along the c-axis.

Conclusions:

  • The material displays localized 4f-electron magnetism without significant Kondo interactions.
  • The observed spin-flip transition is a textbook example for Ising-type antiferromagnetism.
  • CePd2As2 is a promising material for studying fundamental magnetic phenomena.