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Journal of the Korean Physical Society

, Volume 62, Issue 12, pp 2001–2003 | Cite as

Robust magnetic order of Ce 4f-electrons coexisting with superconductivity in CeFeAsO1−x F x

  • T. Shang
  • L. Jiao
  • J. Dai
  • H. Q. Yuan
  • F. F. Balakirev
  • W. Z. Hu
  • N. L. Wang
Article

Abstract

The electrical resistance of CeFeAsO1−x F x (x = 0.06 and 0.08) has been measured in magnetic fields up to 40 T. At zero field, the sample with x = 0.06 shows a structural phase transition around T S ≈ 100 K, followed by a spin-density-wave (SDW) transition around T SDW ≈ 30 K. For x = 0.08, the structural phase transition is suppressed down to T S ≈ 60 K without a clear anomaly associated with the Fe-SDW transition, and superconductivity shows up at T C ≈ 25 K. At lower temperatures, both samples show a clear resistive peak around T N ≈ 4 K, which is associated with the antiferromagnetic (AFM) transition of Ce 4f-electrons. Strikingly, zero resistance is recovered upon a further lowering of the temperature to below T N for x = 0.08. Moreover, we found that the AFM transition of Ce 4f-electrons at 4 K hardly change when a magnetic field of up to 40 T was applied. This was true even in the case of x = 0.08, for which the superconductivity had been partially suppressed at such a large field.

Keywords

Iron pnictides Superconductivity Magnetic phase transition 

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Copyright information

© The Korean Physical Society 2013

Authors and Affiliations

  • T. Shang
    • 1
  • L. Jiao
    • 1
  • J. Dai
    • 1
  • H. Q. Yuan
    • 1
  • F. F. Balakirev
    • 2
  • W. Z. Hu
    • 3
  • N. L. Wang
    • 3
  1. 1.Center for Correlated Matter and Department of PhysicsZhejiang UniversityHangzhou, ZhejiangChina
  2. 2.National High Magnetic Field LaboratoryLos Alamos National LaboratoryLos AlamosUSA
  3. 3.Beijing National Laboratory for Condensed Matter Physics, Institute of PhysicsChinese Academy of ScienceBeijingChina

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