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Low-energy Ce spin excitations in CeFeAsO and CeFeAsO0.84F0.16

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Abstract

We use inelastic neutron scattering to study the low-energy spin excitations of polycrystalline samples of nonsuperconducting CeFeAsO and superconducting CeFeAsO0.84F0.16. Two sharp dispersionless modes are found at 0.85 and 1.16 meV in CeFeAsO below the Ce antiferromagnetic (AF) ordering temperature of T Ce N ˜ 4 K. On warming to above T Ce N ˜ 4 K, these two modes become one broad dispersionless mode that disappears just above the Fe ordering temperature T Fe N ˜ 140 K. For superconducting CeFeAsO0.84F0.16, where Fe static AF order is suppressed, we find a weakly dispersive mode center at 0.4 meV that may arise from short-range Ce-Ce exchange interactions. Using a Heisenberg model, we simulate powder-averaged Ce spin wave excitations. Our results show that we need both Ce spin wave and crystal electric field excitations to account for the whole spectra of low-energy spin excitations.

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Authors and Affiliations

  1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China

    Shi-liang Li  (李世亮), Nan-lin Wang  (王楠林) & Peng-cheng Dai  (戴鹏程)

  2. Department of Physics and Astronomy, The University of Tennessee, Knoxville, TN, 37996-1200, USA

    Shi-liang Li  (李世亮) & Peng-cheng Dai  (戴鹏程)

  3. Department of Physics, Purdue University, West Lafayette, IN, 47907, USA

    Dao-xin Yao  (姚道新), E. W. Carlson & Jiang-ping Hu  (胡江平)

  4. NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA

    Yi-ming Qiu  (邱义铭)

  5. Department of Materials Science and Engineering, University of Maryland, College Park, MD, 20742, USA

    Yi-ming Qiu  (邱义铭)

  6. Department of Physics and Astronomy, Clemson University, Clemson, SC, 29634, USA

    Hye Jung Kang

  7. Department of Phyiscs, Renmin University of China, Beijing, 100872, China

    Gen-fu Chen  (陈根富)

  8. Neutron Scattering Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831-6393, USA

    Peng-cheng Dai  (戴鹏程)

Authors
  1. Shi-liang Li  (李世亮)
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  2. Dao-xin Yao  (姚道新)
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  3. Yi-ming Qiu  (邱义铭)
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  4. Hye Jung Kang
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  5. E. W. Carlson
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  6. Jiang-ping Hu  (胡江平)
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  7. Gen-fu Chen  (陈根富)
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  8. Nan-lin Wang  (王楠林)
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  9. Peng-cheng Dai  (戴鹏程)
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Corresponding author

Correspondence to Peng-cheng Dai  (戴鹏程).

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Li, Sl., Yao, Dx., Qiu, Ym. et al. Low-energy Ce spin excitations in CeFeAsO and CeFeAsO0.84F0.16 . Front. Phys. China 5, 161–165 (2010). https://doi.org/10.1007/s11467-009-0077-8

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  • DOI: https://doi.org/10.1007/s11467-009-0077-8

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