Spatial inhomogeneity inRFeAsO1−xFx(R=Pr, Nd) determined from rare-earth crystal-field excitations

2011/05/31 by E. A. Goremychkin, R. Osborn, C. H. Wang +12 · 1 citation
Materials Science · Physics and Astronomy · #Condensed matter physics #Ion #Iron-based superconductors research #Magnetic and transport properties of perovskites and related materials #Magnetism #Physics #Quantum mechanics #Rare-earth and actinide compounds #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.83.212505

published as Phys. Rev. B 83, 212505 (2011) · 4 pages 4 figures

arxiv created 2011/05/31 · openalex publication_date 2011/06/27 · arxiv updated 2011/06/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We report inelastic neutron-scattering measurements of crystal-field transitions in PrFeAsO, PrFeAsO_0.87F_0.13, and NdFeAsO_0.85F_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 Pr³⁺ and Nd³⁺ ions have nonmagnetic and magnetic ground states, respectively, indicating that the enhancement of T_c compared to LaFeAsO_1\ensuremath-xF_x is not due to rare-earth magnetism.

Citations

• Lattice and magnetic structures of PrFeAsO,PrFeAsO0.85F0.15, andPrFeAsO0.85
• Recent advances in magnetic structure determination by neutron powder diffraction
• Superconductivity at 25 K in hole-doped (La 1-x Sr x )OFeAs
• Superconductivity at 52 K in iron based F doped layered quaternary compound Pr[O1–xFx]FeAs
• Magnetic ordering and negative thermal expansion in PrFeAsO
• Electronic Phase Separation in the Slightly Underdoped Iron Pnictide SuperconductorBa1−xKxFe2As2

Cited by

• Inelastic neutron scattering study of crystal field excitations ofNd3+in NdFeAsO