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Physical properties of RIr3 (R = Gd, Tb, Ho) compounds with coexisting polymorphic phases.

Binita Mondal1, Shovan Dan2, Sudipta Mondal3

  • 1Condensed Matter Physics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India. chandan.mazumdar@saha.ac.in and K.K.M. College, Jamui, Bihar 811307, India.

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Summary
This summary is machine-generated.

Magnetic properties of rare-earth iridium compounds (GdIr3, TbIr3, HoIr3) were studied. Two phases were observed: ferromagnetic (C15b) and paramagnetic (AuCu3), with spin-glass behavior in TbIr3 and HoIr3.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Rare-earth intermetallic compounds exhibit diverse magnetic phenomena.
  • Polymorphism in binary compounds can lead to distinct magnetic properties.
  • Understanding magnetic phase transitions is crucial for materials applications.

Purpose of the Study:

  • To synthesize and characterize binary rare-earth iridium compounds (GdIr3, TbIr3, HoIr3).
  • To investigate the magnetic ordering and critical behavior of these compounds.
  • To determine the universality class of magnetic interactions.

Main Methods:

  • Synthesis of GdIr3, TbIr3, and HoIr3 compounds.
  • DC magnetization and heat capacity measurements.
  • AC susceptibility, magnetic relaxation, and specific heat analyses.

Main Results:

  • Compounds formed with co-existing AuBe5 (C15b) and AuCu3 phases.
  • C15b phase orders ferromagnetically; AuCu3 phase remains paramagnetic.
  • TbIr3 and HoIr3 exhibit spin-glass behavior, unlike GdIr3.
  • Critical exponents (α, β, γ, δ) were estimated for all compounds.

Conclusions:

  • The study elucidates the distinct magnetic behaviors of the two polymorphic phases.
  • Spin-glass characteristics were identified in TbIr3 and HoIr3.
  • Critical analysis provides insights into the magnetic universality classes of these compounds.