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Magnetoelastic effect in R5Pt2In4 (R = Tb-Tm) investigated by neutron powder diffraction.

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|November 7, 2025
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Summary

The thermal expansion of R5Pt2In4 compounds reveals significant changes near magnetic ordering temperatures. Anomalies at lower temperatures indicate order-order magnetic phase transitions, demonstrating a clear magnetoelastic effect.

Keywords:
intermetallicsmagnetic phase transitionsmagnetoelastic effectneutron diffractionrare earth compounds

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • R5Pt2In4 compounds exhibit complex magnetic behaviors.
  • Understanding magnetoelastic effects is crucial for materials design.

Purpose of the Study:

  • To investigate the thermal evolution of unit-cell parameters in R5Pt2In4 (R = Tb-Tm).
  • To identify and characterize magnetic phase transitions and their impact on material properties.

Main Methods:

  • Neutron powder diffraction was employed to analyze thermal expansion.
  • Unit-cell parameters (a, b, c, V) were measured as a function of temperature.

Main Results:

  • Unit-cell parameters showed noticeable changes near the magnetic ordering critical temperature for all compounds.
  • Additional anomalies were observed at lower temperatures for R = Tb-Er, linked to order-order magnetic transitions.
  • The magnetoelastic coupling product was quantified as 0.014(2)%·μB⁻².

Conclusions:

  • The study confirms the presence of a significant magnetoelastic effect in R5Pt2In4 intermetallics.
  • Magnetic phase transitions strongly influence the thermal expansion and structural properties of these materials.