Muon spin rotation and infrared spectroscopy study of magnetism and superconductivity in Ba1xKxFe2As2

B. P. P. Mallett, C. N. Wang, P. Marsik, E. Sheveleva, M. Yazdi-Rizi, J. L. Tallon, P. Adelmann, Th. Wolf, and C. Bernhard
Phys. Rev. B 95, 054512 – Published 22 February 2017

Abstract

Using muon spin rotation and infrared spectroscopy, we study the relation between magnetism and superconductivity in Ba1xKxFe2As2 single crystals from the underdoped to the slightly overdoped regime. We find that the Fe magnetic moment is only moderately suppressed in most of the underdoped region where it decreases more slowly than the Néel temperature TN. This applies for both the total Fe moment obtained from muon spin rotation and for the itinerant component that is deduced from the spectral weight of the spin-density-wave pair-breaking peak in the infrared response. In the moderately underdoped region, superconducting and static magnetic orders coexist on the nanoscale and compete for the same electronic states. The static magnetic moment disappears rather sharply near optimal doping, however, in the slightly overdoped region there is still an enhancement or slowing down of spin fluctuations in the superconducting state. Similar to the gap magnitude reported from specific-heat measurements, the superconducting condensate density is nearly constant in the optimally and slightly overdoped region, but exhibits a rather pronounced decrease on the underdoped side. Several of these observations are similar to the phenomenology in the electron-doped counterpart Ba(Fe1yCoy)2As2.

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  • Received 25 October 2016
  • Revised 17 January 2017

DOI:https://doi.org/10.1103/PhysRevB.95.054512

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

B. P. P. Mallett1,2,*, C. N. Wang2,3, P. Marsik2, E. Sheveleva2, M. Yazdi-Rizi2, J. L. Tallon1, P. Adelmann4, Th. Wolf4, and C. Bernhard2,†

  • 1Robinson Research Institute, Victoria University, P.O. Box 600, Wellington, New Zealand
  • 2University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Chemin du Musée 3, CH-1700 Fribourg, Switzerland
  • 3Masaryk University, Department of Condensed Matter Physics and CEITEC–Central European Institute of Technology, Kotlářská 2, 61137 Brno, Czech Republic
  • 4Institute of Solid State Physics, Karlsruhe Institute of Technology, Postfach 3640, Karlsruhe 76021, Germany

  • *benjamin.mallett@gmail.com
  • christian.bernhard@unifr.ch

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Issue

Vol. 95, Iss. 5 — 1 February 2017

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