Spatial inhomogeneity in RFeAsO1-xFx (R = Pr, Nd) determined from rare-earth crystal-field excitations

@article{Goremychkin2011SpatialII,
  title={Spatial inhomogeneity in RFeAsO1-xFx (R = Pr, Nd) determined from rare-earth crystal-field excitations},
  author={Eugene A. Goremychkin and Ray Osborn and Chang Hai Wang and Mark D. Lumsden and Michael A. McGuire and Athena S Sefat and Brian C. Sales and David G. Mandrus and Henrik M. R{\o}nnow and Y. Su and Andrew D. Christianson},
  journal={Physical Review B},
  year={2011},
  volume={83},
  pages={212505}
}
We report inelastic neutron-scattering measurements of crystal-field transitions in PrFeAsO, PrFeAsO{sub 0.87}F{sub 0.13}, and NdFeAsO{sub 0.85}F{sub 0.15}. Doping with fluorine produces additional crystal-field excitations, providing evidence that there are two distinct charge environments around the rare-earth ions, with probabilities that are consistent with a random distribution of dopants on the oxygen sites. The 4f electrons of the Pr{sup 3+} and Nd{sup 3+} ions have nonmagnetic and… Expand

Figures from this paper

Inelastic Neutron Scattering Studies on the Crystal Field Excitations in Superconducting NdFeAsO 0 . 85 F 0 . 15
Inelastic neutron scattering experiments were performed on polycrystalline samples of NdFeAsO 0.85 F 0.15 over a wide temperature range (3 K–250K). Based on the analysis of the experimental data, aExpand
Theoretical studies of the crystal–field energy levels and EPR g factors for CeFeAsO1−xFx
The ion-based superconductor CeFeAsO1−xFx has received much attention because this rare earth oxypnictide belongs to a new class RFeAsO1−xFx of high-Tc superconductors with critical temperaturesExpand
Segregation of antiferromagnetism and high-temperature superconductivity in Ca 1-x La x Fe 2 As 2
We report the effect of applied pressures on magnetic and superconducting order in single crystals of the aliovalent La-doped iron pnictide material Ca$_{1-x}$La$_{x}$Fe$_{2}$As$_{2}$. UsingExpand
Local lattice distortions vs. structural phase transition in NdFeAsO1-xFx
The lattice properties at low temperatures of two samples of NdFeAsO1-xFx (x = 0.05 and 0.25) have been examined in order to investigate possible structural phase transition that may occur in theExpand
Improvement in granularity of NdFeAsO0.8F0.2 superconductor through Agx doping (x = 0.0–0.3)
Abstract We report the impact of silver addition on granularity of NdFeAsO 0.8 F 0.2 superconductor. The ac susceptibility and electrical resistivity under magnetic field are measured to study theExpand
Inelastic Neutron Scattering Studies on the Crystal Field Excitations in Superconducting NdFeAsO0.85F0.15
Inelastic neutron scattering experiments were performed on polycrystalline samples of NdFeAsO0.85F0.15 over a wide temperature range (3 K–250 K). Based on the analysis of the experimental data, a Nd3
The Role of Yttrium Doping on the Structural and Superconducting Properties of Sm1111 and Its Comparison with Other (RE, Y)1111 (RE $$\varvec{=}$$= La, Ce, and Nd) Iron Oxypnictides
The role of yttrium doping on the structural and superconducting properties of SmFeAsO$$_{1-x}$$1-xF$$_x$$x (Sm1111) is studied in detail and is compared with other yttrium-doped RE1111 (RE—rareExpand
The magnetic and electronic properties of oxyselenides-influence of transition metal ions and lanthanides.
  • C. Stock, E. McCabe
  • Materials Science, Medicine
  • Journal of physics. Condensed matter : an Institute of Physics journal
  • 2016
TLDR
The focus is on the influence of lanthanides and transition metal ions on the intertwined magnetic and electronic properties of oxyselenides and comparisons are made with iron based pnictide and chalcogenide systems. Expand
A few points on iron-based superconductors
Abstract We highlight a few points on iron-based superconductors in this paper. Experimental evidence for intrinsic inhomogeneity and phase separation in Fe-based superconductors is reviewed first.Expand
Giant shifts of crystal-field excitations with temperature as consequence of internal magnetic exchange fields
1School of Physics, The University of New South Wales, Kensington, NSW 2052, Australia 2Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, New IllawarraExpand

References

SHOWING 1-7 OF 7 REFERENCES
Phys Rev B 82
  • 014521
  • 2010
Phys Rev Lett 105
  • 157004
  • 2010
Journal of Physics: Conference Series 150
  • 052088
  • 2009
J Am Chem Soc 130
  • 3296
  • 2008
Science 283
  • 2034
  • 1999
Physica B 192
  • 55
  • 1993