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Title: Crystalline Electric Field as a Probe for Long-Range Antiferromagnetic Order and Superconducting State of CeFeAsO1-xFx

Abstract

We use inelastic neutron scattering to study the crystalline electric field (CEF) excitations of Ce{sup 3+} in CeFeAsO{sub 1-x}F{sub x} (x=0, 0.16). For nonsuperconducting CeFeAsO, the Ce CEF levels have three magnetic doublets in the paramagnetic state, but these doublets split into six singlets when the Fe ions order antiferromagnetically. For superconducting CeFeAsO{sub 0.84}F{sub 0.16} (T{sub c} = 41 K), where the static antiferromagnetic order is suppressed, the Ce CEF levels have three magnetic doublets at {h_bar}{sub {omega}} = 0, 18.7, 58.4 meV at all temperatures. Careful measurements of the intrinsic linewidth {Lambda} and the peak position of the 18.7 meV mode reveal a clear anomaly at T{sub c}, consistent with a strong enhancement of local magnetic susceptibility {chi}{double_prime}({h_bar}{sub {omega}}) below T{sub c}. These results suggest that CEF excitations in the rare-earth oxypnictides can be used as a probe of spin dynamics in the nearby FeAs planes.

Authors:
 [1];  [2];  [2];  [2];  [1];  [3];  [4];  [4];  [4];  [5];  [5];  [3]
  1. University of Tennessee, Knoxville (UTK)
  2. ISIS Facility, Rutherford Appleton Laboratory
  3. ORNL
  4. National Institute of Standards and Technology (NIST)
  5. Chinese Academy of Sciences
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:
944112
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 101; Journal Issue: 0031-900; Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ELECTRIC FIELDS; MAGNETIC SUSCEPTIBILITY; NEUTRONS; PROBES; SCATTERING; SPIN

Citation Formats

Chi, Songxue, Adroja, D. T., GUIDI, T., Bewley, Robert I., Li, Shiliang, Zhao, Jun, Lynn, J. W., Brown, C. M., Qiu, Y., Chen, G. F,, Luo, J. L., Wang, N. L., and Dai, Pengcheng. Crystalline Electric Field as a Probe for Long-Range Antiferromagnetic Order and Superconducting State of CeFeAsO1-xFx. United States: N. p., 2008. Web. doi:10.1103/PhysRevLett.101.217002.
Chi, Songxue, Adroja, D. T., GUIDI, T., Bewley, Robert I., Li, Shiliang, Zhao, Jun, Lynn, J. W., Brown, C. M., Qiu, Y., Chen, G. F,, Luo, J. L., Wang, N. L., & Dai, Pengcheng. Crystalline Electric Field as a Probe for Long-Range Antiferromagnetic Order and Superconducting State of CeFeAsO1-xFx. United States. https://doi.org/10.1103/PhysRevLett.101.217002
Chi, Songxue, Adroja, D. T., GUIDI, T., Bewley, Robert I., Li, Shiliang, Zhao, Jun, Lynn, J. W., Brown, C. M., Qiu, Y., Chen, G. F,, Luo, J. L., Wang, N. L., and Dai, Pengcheng. Tue . "Crystalline Electric Field as a Probe for Long-Range Antiferromagnetic Order and Superconducting State of CeFeAsO1-xFx". United States. https://doi.org/10.1103/PhysRevLett.101.217002.
@article{osti_944112,
title = {Crystalline Electric Field as a Probe for Long-Range Antiferromagnetic Order and Superconducting State of CeFeAsO1-xFx},
author = {Chi, Songxue and Adroja, D. T. and GUIDI, T. and Bewley, Robert I. and Li, Shiliang and Zhao, Jun and Lynn, J. W. and Brown, C. M. and Qiu, Y. and Chen, G. F, and Luo, J. L. and Wang, N. L. and Dai, Pengcheng},
abstractNote = {We use inelastic neutron scattering to study the crystalline electric field (CEF) excitations of Ce{sup 3+} in CeFeAsO{sub 1-x}F{sub x} (x=0, 0.16). For nonsuperconducting CeFeAsO, the Ce CEF levels have three magnetic doublets in the paramagnetic state, but these doublets split into six singlets when the Fe ions order antiferromagnetically. For superconducting CeFeAsO{sub 0.84}F{sub 0.16} (T{sub c} = 41 K), where the static antiferromagnetic order is suppressed, the Ce CEF levels have three magnetic doublets at {h_bar}{sub {omega}} = 0, 18.7, 58.4 meV at all temperatures. Careful measurements of the intrinsic linewidth {Lambda} and the peak position of the 18.7 meV mode reveal a clear anomaly at T{sub c}, consistent with a strong enhancement of local magnetic susceptibility {chi}{double_prime}({h_bar}{sub {omega}}) below T{sub c}. These results suggest that CEF excitations in the rare-earth oxypnictides can be used as a probe of spin dynamics in the nearby FeAs planes.},
doi = {10.1103/PhysRevLett.101.217002},
url = {https://www.osti.gov/biblio/944112}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 0031-900,
volume = 101,
place = {United States},
year = {2008},
month = {1}
}