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Gd2Te3: an antiferromagnetic semimetal.

I Panneer Muthuselvam1,2,3, Raja Nehru3,4, K Ramesh Babu5,6

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Gadolinium telluride (Gd2Te3) exhibits antiferromagnetic ordering at 10 K, with the b-axis as the easy magnetization direction. Field-induced spin-flop transitions were observed, consistent with theoretical predictions.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Gadolinium telluride (Gd2Te3) is a material with potential magnetic properties.
  • Understanding its magnetic ordering and phase transitions is crucial for its application.
  • Previous studies may not have fully characterized its magnetic behavior under various conditions.

Purpose of the Study:

  • To precisely characterize the magnetic properties of Gd2Te3 single crystals.
  • To investigate the influence of external magnetic fields on its magnetic phase transitions.
  • To theoretically validate the experimental findings using first-principles calculations.

Main Methods:

  • High-precision measurements of magnetization, magnetic susceptibility, specific heat, and electrical resistivity.
  • Experiments conducted over wide ranges of temperature and magnetic field applied along different crystallographic axes.
  • First-principles electronic band structure and density of states calculations based on density functional theory.

Main Results:

  • Established the b-axis as the easy direction of magnetization and the ac-plane as a hard direction.
  • Observed a paramagnetic (PM) to antiferromagnetic (AFM) phase transition at the Néel temperature (TN = 10 K).
  • Identified field-induced spin-flop transitions between 4.0 T and 4.5 T at low temperatures.
  • Theoretical calculations accurately predicted the AFM ground state, semi-metallic behavior, and magnetic properties.

Conclusions:

  • Gd2Te3 exhibits complex magnetic behavior characterized by AFM ordering and field-induced transitions.
  • The b-axis is confirmed as the easy axis of magnetization.
  • First-principles calculations provide strong support for the experimental observations, elucidating the underlying electronic and magnetic interactions.