Journal article

Muon spin rotation and infrared spectroscopy study of Ba$_{1-x}$Na$_{x}$Fe$_{2}$As$_{2}$

  • Sheveleva, Evgeniia University of Fribourg
  • Xu, Bing University of Fribourg
  • Marsik, Premysl University of Fribourg
  • Lyzwa, Fryderyk University of Fribourg
  • Mallett, Benjamin P. P. The MacDiarmid Institute for Advanced Materials and Nanotechnology and The Dodd-Walls Centre for Photonic and Quantum Technologies, The University of Auckland, NZ-1010 Auckland, New Zealand
  • Willa, K. Institute for Quantum Materials and Technologies - IQMT, Postfach 3640, DE-76021 Karlsruhe, Germany
  • Meingast, C. Institute for Quantum Materials and Technologies - IQMT, Postfach 3640, DE-76021 Karlsruhe, Germany
  • Wolf, Th. Institute for Quantum Materials and Technologies - IQMT, Postfach 3640, DE-76021 Karlsruhe, Germany
  • Shevtsova, T. O. O. Galkin Donetsk Institute for Physics and Engineering NAS of Ukraine, UA-03680 Kyiv, Ukraine
  • Pashkevich, Yu. G. O. O. Galkin Donetsk Institute for Physics and Engineering NAS of Ukraine, UA-03680 Kyiv, Ukraine
  • Bernhard, Christian University of Fribourg
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    2020
Published in:
  • Physical Review B. - 2020, vol. 101, no. 22, p. 224515
English The magnetic and superconducting properties of a series of underdoped Ba 1 − x Na x Fe 2 As 2 (BNFA) single crystals with 0.19 ≤ x ≤ 0.34 have been investigated with the complementary muon-spin-rotation ( μ SR ) and infrared spectroscopy techniques. The focus has been on the different antiferromagnetic states in the underdoped regime and their competition with superconductivity, especially for the ones with a tetragonal crystal structure and a so-called double-Q magnetic order. Besides the collinear state with a spatially inhomogeneous spin-charge-density wave (i-SCDW) order at x = 0.24 and 0.26, that was previously identified in BNFA, we obtained evidence for an orthomagnetic state with a “hedgehog”-type spin vortex crystal (SVC) structure at x = 0.32 and 0.34. Whereas in the former i-SCDW state the infrared spectra show no sign of a superconducting response down to the lowest measured temperature of about 10 K, in the SVC state there is a strong superconducting response similar to the one at optimum doping. The magnetic order is strongly suppressed here in the superconducting state and at x = 0.34 there is even a partial reentrance into a paramagnetic state at T ≪ T c .
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/309267
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