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Title: Spatial inhomogeneity in RFeAs(O,F)(R=Pr,Nd) as revealed by studies of the 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];  [2];  [2];  [2];  [2];  [2];  [2];  [3];  [4];  [2]
  1. Argonne National Laboratory (ANL)
  2. ORNL
  3. Lab for Quantum Magnetism, Switzerland
  4. Forschungszentrum Julich, Julich, Germany
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); High Flux Isotope Reactor
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1017314
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 83; Journal Issue: 21; Journal ID: ISSN 1098--0121
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, Cuihuan, Lumsden, Mark D, McGuire, Michael A, Safa-Sefat, Athena, Sales, Brian C, Mandrus, David, Ronnow, H. M., Su, Y., and Christianson, Andrew D. Spatial inhomogeneity in RFeAs(O,F)(R=Pr,Nd) as revealed by studies of the rare earth crystal field excitations. United States: N. p., 2011. Web. doi:10.1103/PhysRevB.83.212505.
Goremychkin, E. A., Osborn, R., Wang, Cuihuan, Lumsden, Mark D, McGuire, Michael A, Safa-Sefat, Athena, Sales, Brian C, Mandrus, David, Ronnow, H. M., Su, Y., & Christianson, Andrew D. Spatial inhomogeneity in RFeAs(O,F)(R=Pr,Nd) as revealed by studies of the rare earth crystal field excitations. United States. https://doi.org/10.1103/PhysRevB.83.212505
Goremychkin, E. A., Osborn, R., Wang, Cuihuan, Lumsden, Mark D, McGuire, Michael A, Safa-Sefat, Athena, Sales, Brian C, Mandrus, David, Ronnow, H. M., Su, Y., and Christianson, Andrew D. Sat . "Spatial inhomogeneity in RFeAs(O,F)(R=Pr,Nd) as revealed by studies of the rare earth crystal field excitations". United States. https://doi.org/10.1103/PhysRevB.83.212505.
@article{osti_1017314,
title = {Spatial inhomogeneity in RFeAs(O,F)(R=Pr,Nd) as revealed by studies of the rare earth crystal field excitations},
author = {Goremychkin, E. A. and Osborn, R. and Wang, Cuihuan and Lumsden, Mark D and McGuire, Michael A and Safa-Sefat, Athena and Sales, Brian C and Mandrus, David and Ronnow, H. M. and Su, Y. and Christianson, Andrew D},
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/1017314}, journal = {Physical Review B},
issn = {1098--0121},
number = 21,
volume = 83,
place = {United States},
year = {2011},
month = {1}
}