Infrared Study of the Spin Reorientation Transition and Its Reversal in the Superconducting State in Underdoped Ba1xKxFe2As2

B. P. P. Mallett, P. Marsik, M. Yazdi-Rizi, Th. Wolf, A. E. Böhmer, F. Hardy, C. Meingast, D. Munzar, and C. Bernhard
Phys. Rev. Lett. 115, 027003 – Published 8 July 2015
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Abstract

With infrared spectroscopy we investigated the spin-reorientation transition from an orthorhombic antiferromagnetic (o-AF) to a tetragonal AF (t-AF) phase and the reentrance of the o-AF phase in the superconducting state of underdoped Ba1xKxFe2As2. In agreement with the predicted transition from a single-Q to a double-Q AF structure, we found that a distinct spin density wave develops in the t-AF phase. The pair breaking peak of this spin density wave acquires much more low-energy spectral weight than the one in the o-AF state which indicates that it competes more strongly with superconductivity. We also observed additional phonon modes in the t-AF phase which likely arise from a Brillouin-zone folding that is induced by the double-Q magnetic structure with two Fe sublattices exhibiting different magnitudes of the magnetic moment.

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  • Received 16 January 2015

DOI:https://doi.org/10.1103/PhysRevLett.115.027003

© 2015 American Physical Society

Authors & Affiliations

B. P. P. Mallett1,*, P. Marsik1, M. Yazdi-Rizi1, Th. Wolf2, A. E. Böhmer2, F. Hardy2, C. Meingast2, D. Munzar3, and C. Bernhard1

  • 1University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Chemin du Musée 3, CH-1700 Fribourg, Switzerland
  • 2Institute of Solid State Physics, Karlsruhe Institute of Technology, Postfach 3640, Karlsruhe 76021, Germany
  • 3Department of Condensed Matter Physics, Faculty of Science and Central European Institute of Technology, Masaryk University, Kotlářska 2, 61137 Brno, Czech Republic

  • *benjamin.mallett@unifr.ch

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Vol. 115, Iss. 2 — 10 July 2015

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