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75 As NMR local probe study of magnetism in (Eu 1−x K x )Fe 2 As 2

Author

Listed:
  • Tusharkanti Dey
  • Panchanana Khuntia
  • Avinash Mahajan
  • Anupam
  • Zakir Hossain

Abstract

75 As NMR measurements were performed as a function of temperature and doping in Eu 1−x K x Fe 2 As 2 (x=0.5,0.7) samples. The large Eu 2+ moments and their fluctuations are found to dominate the 75 As NMR properties. The 75 As nuclei close to the Eu 2+ moments likely have a very short spin-spin relaxation time (T 2 ) and are wiped out of our measurement window. The 75 As nuclei relatively far from Eu 2+ moments are probed in this study. Increasing the Eu content progressively decreases the signal intensity with no signal found for the full-Eu sample (x=0). The large 75 As NMR linewidth arises from an inhomogeneous magnetic environment around them. The spin lattice relaxation rate (1/T 1 ) for x=0.5 and 0.7 samples is nearly independent of temperature above 100 K and results from a dipolar coupling to paramagnetic fluctuations of the Eu 2+ moments. The behavior of 1/T 1 at lower temperatures has contributions from the antiferromagnetic fluctuations of the Eu 2+ moments as also the fluctuations intrinsic to the FeAs planes and from superconductivity. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Suggested Citation

  • Tusharkanti Dey & Panchanana Khuntia & Avinash Mahajan & Anupam & Zakir Hossain, 2013. "75 As NMR local probe study of magnetism in (Eu 1−x K x )Fe 2 As 2," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 86(11), pages 1-6, November.
    • Handle: RePEc:spr:eurphb:v:86:y:2013:i:11:p:1-6:10.1140/epjb/e2013-40483-6
    DOI: 10.1140/epjb/e2013-40483-6
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    Solid State and Materials;

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