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Infrared Study of the Spin Reorientation Transition and Its Reversal in the Superconducting State in Underdoped Ba(1-x)K(x)Fe(2)As(2).
Mallett, B P P; Marsik, P; Yazdi-Rizi, M; Wolf, Th; Böhmer, A E; Hardy, F; Meingast, C; Munzar, D; Bernhard, C.
Affiliation
  • Mallett BP; University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Chemin du Musée 3, CH-1700 Fribourg, Switzerland.
  • Marsik P; University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Chemin du Musée 3, CH-1700 Fribourg, Switzerland.
  • Yazdi-Rizi M; University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Chemin du Musée 3, CH-1700 Fribourg, Switzerland.
  • Wolf T; Institute of Solid State Physics, Karlsruhe Institute of Technology, Postfach 3640, Karlsruhe 76021, Germany.
  • Böhmer AE; Institute of Solid State Physics, Karlsruhe Institute of Technology, Postfach 3640, Karlsruhe 76021, Germany.
  • Hardy F; Institute of Solid State Physics, Karlsruhe Institute of Technology, Postfach 3640, Karlsruhe 76021, Germany.
  • Meingast C; Institute of Solid State Physics, Karlsruhe Institute of Technology, Postfach 3640, Karlsruhe 76021, Germany.
  • Munzar D; Department of Condensed Matter Physics, Faculty of Science and Central European Institute of Technology, Masaryk University, Kotlárska 2, 61137 Brno, Czech Republic.
  • Bernhard C; University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Chemin du Musée 3, CH-1700 Fribourg, Switzerland.
Phys Rev Lett ; 115(2): 027003, 2015 Jul 10.
Article in En | MEDLINE | ID: mdl-26207497
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 Ba(1-x)K(x)Fe(2)As(2). 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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Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2015 Document type: Article
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Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2015 Document type: Article