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

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

doi:10.1103/PhysRevB.83.212505

Spatial inhomogeneity in RFeAsO_1-xF_x (R= Pr, Nd) determined from rare-earth crystal-field excitations

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

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

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-xF_x is not due to rare-earth magnetism.

Original language	English
Article number	212505
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	83
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevB.83.212505
State	Published - Jun 27 2011

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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., Rønnow, H. M., Su, Y., & Christianson, A. D. (2011). Spatial inhomogeneity in RFeAsO_1-xF_x (R= Pr, Nd) determined from rare-earth crystal-field excitations. Physical Review B - Condensed Matter and Materials Physics, 83(21), Article 212505. https://doi.org/10.1103/PhysRevB.83.212505

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

abstract = "We report inelastic neutron-scattering measurements of crystal-field transitions in PrFeAsO, PrFeAsO0.87F0.13, and NdFeAsO 0.85F0.15. 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 Tc compared to LaFeAsO1-xFx is not due to rare-earth magnetism.",

author = "Goremychkin, \{E. A.\} and R. Osborn and Wang, \{C. H.\} and Lumsden, \{M. D.\} and McGuire, \{M. A.\} and Sefat, \{A. S.\} and Sales, \{B. C.\} and D. Mandrus and R{\o}nnow, \{H. M.\} and Y. Su and Christianson, \{A. D.\}",

year = "2011",

month = jun,

day = "27",

doi = "10.1103/PhysRevB.83.212505",

language = "English",

volume = "83",

journal = "Physical Review B - Condensed Matter and Materials Physics",

issn = "1098-0121",

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Goremychkin, EA, Osborn, R, Wang, CH, Lumsden, MD , McGuire, MA, Sefat, AS, Sales, BC, Mandrus, D, Rønnow, HM, Su, Y & Christianson, AD 2011, 'Spatial inhomogeneity in RFeAsO_1-xF_x (R= Pr, Nd) determined from rare-earth crystal-field excitations', Physical Review B - Condensed Matter and Materials Physics, vol. 83, no. 21, 212505. https://doi.org/10.1103/PhysRevB.83.212505

TY - JOUR

T1 - Spatial inhomogeneity in RFeAsO1-xFx (R= Pr, Nd) determined from rare-earth crystal-field excitations

AU - Goremychkin, E. A.

AU - Osborn, R.

AU - Wang, C. H.

AU - Lumsden, M. D.

AU - McGuire, M. A.

AU - Sefat, A. S.

AU - Sales, B. C.

AU - Mandrus, D.

AU - Rønnow, H. M.

AU - Su, Y.

AU - Christianson, A. D.

PY - 2011/6/27

Y1 - 2011/6/27

N2 - We report inelastic neutron-scattering measurements of crystal-field transitions in PrFeAsO, PrFeAsO0.87F0.13, and NdFeAsO 0.85F0.15. 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 Tc compared to LaFeAsO1-xFx is not due to rare-earth magnetism.

AB - We report inelastic neutron-scattering measurements of crystal-field transitions in PrFeAsO, PrFeAsO0.87F0.13, and NdFeAsO 0.85F0.15. 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 Tc compared to LaFeAsO1-xFx is not due to rare-earth magnetism.

UR - https://www.scopus.com/pages/publications/79961132988

U2 - 10.1103/PhysRevB.83.212505

DO - 10.1103/PhysRevB.83.212505

M3 - Article

AN - SCOPUS:79961132988

SN - 1098-0121

VL - 83

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 21

M1 - 212505

ER -

Spatial inhomogeneity in RFeAsO_1-xF_x (R= Pr, Nd) determined from rare-earth crystal-field excitations

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