Journal Article

PreJuSER-15731

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Spatial inhomogeneity in RFeAsO(1-x)F(x) (R = Pr, Nd) determined from rare-earth crystal-field excitations

Goremychkin, E. A. ; Osborn, R. ; Wang, C. H. ; Lumsden, M. D. ; McGuire, M. A. ; Sefat, A. S. ; Sales, B. C. ; Mandrus, D. ; Ronnow, H. M. ; Su, Y.FZJ* ; Christianson, A. D.

2011
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/10934  doi:10.1103/PhysRevB.83.212505

Abstract: We report inelastic neutron-scattering measurements of crystal-field transitions in PrFeAsO, PrFeAsO0.87F0.13, and NdFeAsO0.85F0.15. 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 LaFeAsO1-xFx is not due to rare-earth magnetism.

Keyword(s): Basic research (1st) ; Others (1st) ; Condensed Matter Physics (2nd) ; J

Note: We acknowledge useful discussions with E. Dagotto and assistance in the neutron-scattering experiments from O. Garlea (ORNL), T. Guidi (ISIS), A. Orecchini (ILL), and M. Koza (ILL). Research at Argonne and Oak Ridge is supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division and Scientific User Facilities Division (Argonne Contract No. DE-AC02-06CH11357).

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Contributing Institute(s):

1. Streumethoden (PGI-4)
2. JCNS-FRM-II (JCNS (München) ; Jülich Centre for Neutron Science JCNS (München) ; JCNS-FRM-II)
3. Streumethoden (JCNS-2)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)
2. Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) (P55)

Experiment(s):

1. DNS: Diffuse scattering neutron time of flight spectrometer (NL6S)

Appears in the scientific report 2011

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