Journal article

Competing superconducting and magnetic order parameters and field-induced magnetism in electron-doped $\mathrm{Ba}{({\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x})}_{2}{\mathrm{As}}_{2}$

  • Larsen, J. Department of Physics, Technical University of Denmark, Kongens Lyngby, Denmark
  • Mencia Uranga, B. Niels Bohr Institute, University of Copenhagen, Denmark
  • Stieper, G. Niels Bohr Institute, University of Copenhagen, Denmark
  • Holm, S. L. Niels Bohr Institute, University of Copenhagen, Denmark - Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, Villigen, Switzerland
  • Bernhard, Christian University of Fribourg, Department of Physics and Fribourg Centre for Nanomaterials, Switzerland
  • Wolf, T. Karlsruher Institut für Technologie, Institut für Festkörperphysik, Germany
  • Lefmann, K. Niels Bohr Institute, University of Copenhagen, Denmark
  • Andersen, B. M. Niels Bohr Institute, University of Copenhagen, Denmark
  • Niedermayer, Christof Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, Villigen, Switzerland
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    13.01.2015
Published in:
  • Physical Review B. - 2015, vol. 91, no. 2, p. 024504
English We have studied the magnetic and superconducting properties of Ba(Fe0.95Co0.05)2As2 as a function of temperature and external magnetic field using neutron scattering and muon spin rotation. Below the superconducting transition temperature the magnetic and superconducting order parameters coexist and compete. A magnetic field can significantly enhance the magnetic scattering in the superconducting state, roughly doubling the Bragg intensity at 13.5 T. We perform a microscopic modeling of the data by use of a five-band Hamiltonian relevant to iron pnictides. In the superconducting state, vortices can slow down and freeze spin fluctuations locally. When such regions couple they result in a long-range ordered antiferromagnetic phase producing the enhanced magnetic elastic scattering in agreement with experiments.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
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Persistent URL
https://folia.unifr.ch/unifr/documents/304275
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