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

doi:https://doi.org/10.1103/PhysRevB.83.212505

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

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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:

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 ^[1]

Materials Science Division

Publication Date:: 2011-06-27

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.

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                    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

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                    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.

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@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}

}

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