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Evolution from sinusoidal to collinear A-type antiferromagnetic spin-ordered magnetic phase transition in

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Praseodymium doping in terbium manganites suppresses sinusoidal magnetic structures, leading to collinear antiferromagnetic ordering. This study reveals structural and magnetic phase transitions in Tb$_{0.6}$Pr$_{0.4}$MnO$_{3}$ using neutron powder diffraction.

Keywords:
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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Rare-earth manganites exhibit complex magnetic and structural properties.
  • Terbium manganite (TbMnO$_{3}$) shows a sinusoidal magnetic structure.
  • Praseodymium manganite (PrMnO$_{3}$) has distinct magnetic ordering.

Purpose of the Study:

  • To investigate the structural and magnetic phase transitions in Pr-doped Tb$_{0.6}$Pr$_{0.4}$MnO$_{3}$.
  • To understand the effect of Pr$^{3+}$ substitution on the magnetic ordering of TbMnO$_{3}$.
  • To determine the magnetic structure and its evolution with temperature.

Main Methods:

  • High-resolution neutron powder diffraction (NPD) at SINQ spallation source.
  • Rietveld refinement analysis of x-ray diffraction (XRD) data at room temperature.
  • Temperature-dependent dc magnetization studies (zero field-cooled and field-cooled).
  • Field-dependent magnetization measurements at low temperatures.

Main Results:

  • Tb$_{0.6}$Pr$_{0.4}$MnO$_{3}$ crystallizes in the orthorhombic GdFeO$_{3}$ type structure (Pnma space group).
  • Pr$^{3+}$ substitution suppresses the sinusoidal magnetic structure of TbMnO$_{3}$, inducing collinear A-type antiferromagnetic ordering.
  • Magnetic structures solved at various temperatures confirm A-type antiferromagnetic spin arrangement (Pn'ma magnetic space group).
  • A weak ferromagnetic component and coercivity (approx. 2 kOe) observed at low temperatures due to canted spins or Terbium ordering.

Conclusions:

  • Praseodymium doping significantly alters the magnetic phase transitions in terbium manganites.
  • The synthesized Tb$_{0.6}$Pr$_{0.4}$MnO$_{3}$ exhibits robust orthorhombic nuclear structure down to 1.5 K.
  • The study elucidates the evolution from sinusoidal to A-type antiferromagnetic ordering upon Pr doping.