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Spin-state transition in the Fe pnictides.

H Gretarsson1, S R Saha2, T Drye2

  • 1Department of Physics, University of Toronto, 60 Saint George Street, Toronto, Ontario M5S 1A7, Canada.

Physical Review Letters
|August 29, 2014
PubMed
Summary

Rare-earth doping in iron pnictides Ca(1-x)RE(x)Fe(2)As(2) reveals temperature-dependent magnetic moments. A spin-state transition and nonmagnetic Fe(2+) ions are observed in the collapsed tetragonal phase.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Chemistry

Background:

  • Rare-earth doped iron pnictides, such as Ca(1-x)RE(x)Fe(2)As(2), are complex materials with tunable electronic and magnetic properties.
  • Understanding the behavior of local magnetic moments is crucial for designing novel electronic and magnetic devices.

Purpose of the Study:

  • To investigate the local magnetic moments in rare-earth doped Ca(1-x)RE(x)Fe(2)As(2) using Fe Kβ x-ray emission spectroscopy.
  • To explore the relationship between temperature, lattice structure, and magnetic moment behavior in these materials.

Main Methods:

  • Fe Kβ x-ray emission spectroscopy was employed to probe local magnetic moments.
  • Measurements were conducted across a range of temperatures (300 K down to 70 K) on samples doped with Lanthanum (La), Praseodymium (Pr), and Neodymium (Nd).

Main Results:

  • The Fe local moment significantly decreases with temperature, from ~0.9 μ(B) at 300 K to ~0.45 μ(B) at 70 K.
  • In the collapsed tetragonal phase (T<70 K) of Pr- and Nd-doped samples, the local moment is quenched, unlike the La-doped sample.
  • Evidence for a spin-state transition and nonmagnetic Fe(2+) ions in the collapsed tetragonal phase was found for Pr- and Nd-doped samples.

Conclusions:

  • Ca(1-x)RE(x)Fe(2)As(2) (RE = Pr, Nd) exhibits a spin-state transition, providing direct evidence for nonmagnetic Fe(2+) ions in the collapsed tetragonal phase.
  • The gradual spin-state change suggests the importance of multiorbital physics, specifically the interplay between crystal field splitting of Fe 3d orbitals and Hund's rule coupling.