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Magnetostructural behavior in the non-centrosymmetric compound Nd7Pd3.

Y Mudryk1, C Ritter, D Paudyal

  • 1The Ames Laboratory, U.S. Department of Energy, Ames, IA 50011-3020, United States of America.

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The study reveals that Neodymium-7 Palladium-3 (Nd7Pd3) exhibits multiple magnetic transitions upon cooling, including antiferromagnetic and ferromagnetic ordering. This transition involves a significant change in crystal structure and magnetoelastic effects.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Neodymium-Palladium compounds are of interest for their magnetic properties.
  • Understanding magnetic ordering transitions is crucial for developing new magnetic materials.

Purpose of the Study:

  • To systematically investigate the physical properties and microscopic magnetism of the Nd7Pd3 compound.
  • To characterize the magnetic ordering transitions and their effect on crystal structure.

Main Methods:

  • Experimental measurements of physical properties and magnetic behavior.
  • Crystallographic analysis to determine structural changes.
  • Density functional theory (DFT) calculations for ground state confirmation.

Main Results:

  • Nd7Pd3 crystallizes in a hexagonal Th7Fe3-type structure (P63mc) at room temperature.
  • Observed magnetic ordering transitions: antiferromagnetic at 37 K (TN) and ferromagnetic at 33 K (TC).
  • The ferromagnetic transition at TC is first-order and magnetoelastic, inducing a crystal symmetry change to Cmc21.
  • DFT calculations confirm the experimentally observed ground state with the a-axis as the easy magnetization direction.

Conclusions:

  • Nd7Pd3 exhibits complex magnetic behavior with distinct antiferromagnetic and ferromagnetic phases.
  • The ferromagnetic transition is coupled with a structural phase transition, highlighting magnetoelastic coupling.
  • The study provides insights into the magnetic anisotropy and ground state properties of Nd7Pd3.