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Title: Spatial inhomogeneity in RFeAs(O,F)(R = Pr, Nd) determined from rare earth crystal field excitations.

Abstract

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 magnetic ground states, respectively, indicating that the enhancement of T{sub c} compared to LaFeAsO{sub 1-x}F{sub x} is not due to rare-earth magnetism.

Authors:
; ; ; ; ; ; ; ; ; ;  [1]
  1. Materials Science Division
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1018908
Report Number(s):
ANL/MSD/JA-69843
TRN: US201114%%412
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Phys. Rev. B
Additional Journal Information:
Journal Volume: 83; Journal Issue: 21 ; Jun. 27, 2011
Country of Publication:
United States
Language:
ENGLISH
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CRYSTAL FIELD; DISTRIBUTION; ELECTRONS; FLUORINE; GROUND STATES; MAGNETISM; OXYGEN; RARE EARTHS

Citation Formats

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, Christianson, A D, Rutherford Appleton Lab.), Oak Ridge Nat. Lab.), Ecole Polytechnique), and Julich Center for Neutron Science). Spatial inhomogeneity in RFeAs(O,F)(R = Pr, Nd) determined from rare earth crystal field excitations.. United States: N. p., 2011. Web. doi:10.1103/PhysRevB.83.212505.
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, Christianson, A D, Rutherford Appleton Lab.), Oak Ridge Nat. Lab.), Ecole Polytechnique), & Julich Center for Neutron Science). Spatial inhomogeneity in RFeAs(O,F)(R = Pr, Nd) determined from rare earth crystal field excitations.. United States. https://doi.org/10.1103/PhysRevB.83.212505
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, Christianson, A D, Rutherford Appleton Lab.), Oak Ridge Nat. Lab.), Ecole Polytechnique), and Julich Center for Neutron Science). Mon . "Spatial inhomogeneity in RFeAs(O,F)(R = Pr, Nd) determined from rare earth crystal field excitations.". United States. https://doi.org/10.1103/PhysRevB.83.212505.
@article{osti_1018908,
title = {Spatial inhomogeneity in RFeAs(O,F)(R = Pr, Nd) determined from rare earth crystal field excitations.},
author = {Goremychkin, E A and Osborn, R and Wang, C H and Lumsden, M D and McGuire, M A and Sefat, A S and Sales, B C and Mandrus, D and Ronnow, H M and Su, Y and Christianson, A D and Rutherford Appleton Lab.) and Oak Ridge Nat. Lab.) and Ecole Polytechnique) and Julich Center for Neutron Science)},
abstractNote = {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 magnetic ground states, respectively, indicating that the enhancement of T{sub c} compared to LaFeAsO{sub 1-x}F{sub x} is not due to rare-earth magnetism.},
doi = {10.1103/PhysRevB.83.212505},
url = {https://www.osti.gov/biblio/1018908}, journal = {Phys. Rev. B},
number = 21 ; Jun. 27, 2011,
volume = 83,
place = {United States},
year = {2011},
month = {6}
}