Journal article

Muon spin rotation study of magnetism and superconductivity in BaFe2−xCoxAs₂ and Pr1−xSrxFeAsO

  • Bernhard, Christian Department of Physics and Fribourg Center for Nanomaterials - Frimat, University of Fribourg, Switzerland -
  • Drew, Alan J. Department of Physics and Fribourg Center for Nanomaterials - Frimat, University of Fribourg, Switzerland - Queen Mary University of London, UK
  • Schulz, Leander Department of Physics and Fribourg Center for Nanomaterials - Frimat, University of Fribourg, Switzerland
  • Malik, Vivek Kumar Department of Physics and Fribourg Center for Nanomaterials - Frimat, University of Fribourg, Switzerland
  • Rössle, Matthias Department of Physics and Fribourg Center for Nanomaterials - Frimat, University of Fribourg, Switzerland
  • Niedermayer, Ch. Laboratory for Neutron Scattering, ETHZ & PSI, Switzerland
  • Wolf, Th. Forschungszentrum Karlsruhe, Germany
  • Varma, G. D. Department of Physics, Indian Institute of Technology Roorkee, India
  • Mu, G. National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Science, China
  • Wen, H.-H. National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Science, China
  • Liu, H. University of Science and Technology of China, Hefei, Anhui, China
  • Wu, G. University of Science and Technology of China, Hefei, Anhui, China -
  • Chen, X. H. University of Science and Technology of China, Hefei, Anhui, China
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    19.05.2009
Published in:
  • New Journal of Physics. - 2009, vol. 11, p. 055050
English We present a muon spin rotation (μSR) study of the magnetic and superconducting properties of single crystals of electron-doped BaFe2−xCoxAs₂ with x = 0.08, 0.20 and 0.25 (Tc = 9, 25 and 20 K) and of polycrystalline hole-doped Pr1−xSrxFeAsO with x = 0 and 0.2 (Tc = 15 K). In the former series, we observe some interesting parallels with the electron-doped SmFeAsO1−xFx 1111-type system (Drew et al 2009 Nat. Mater. 8 310). In particular, we obtain evidence that strongly disordered static magnetism coexists with superconductivity on a microscopic scale in underdoped samples and even at optimum doping there is a slowing down (or enhancement) of dynamic magnetic correlations below Tc≈25 K. In contrast, for the hole-doped Pr1−xSrxFeAsO samples we obtain evidence for a mesoscopic phase segregation into regions with nearly unperturbed antiferromagnetic (AF) order and others that are non-magnetic and most likely superconducting. The observed trend resembles the one that was previously reported for hole-doped Ba1−xKxFe₂As₂ (Aczel et al 2008 Phys. Rev. B 78 214503, Park et al 2009 Phys. Rev. Lett. 102 117006) and thus might be a common property of the hole-doped systems.
Faculty
Faculté des sciences
Department
Physique
Language
  • English
Classification
Physics
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https://folia.unifr.ch/unifr/documents/301204
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