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75As NMR local probe study of magnetism in (Eu1−xKx)Fe2As2

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Abstract

75As NMR measurements were performed as a function of temperature and doping in Eu1−x K x Fe2As2 (x = 0.5,0.7) samples. The large Eu2+ moments and their fluctuations are found to dominate the 75As NMR properties. The 75As nuclei close to the Eu2+ moments likely have a very short spin-spin relaxation time (T 2) and are wiped out of our measurement window. The 75As nuclei relatively far from Eu2+ 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 75As 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 Eu2+ moments. The behavior of 1/T 1 at lower temperatures has contributions from the antiferromagnetic fluctuations of the Eu2+ moments as also the fluctuations intrinsic to the FeAs planes and from superconductivity.

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Author notes

  1. Tusharkanti Dey

    Present address: IFW Dresden, 01171, Dresden, Germany

  2. Panchanana Khuntia

    Present address: Max-Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany

Authors and Affiliations

  1. Department of Physics, Indian Institute of Technology Bombay, Powai, 400076, Mumbai, India

    Tusharkanti Dey, Panchanana Khuntia & Avinash V. Mahajan

  2. Department of Physics, Indian Institute of Technology Kanpur, 208016, Kanpur, India

    Anupam & Zakir Hossain

Authors
  1. Tusharkanti Dey
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  2. Panchanana Khuntia
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  3. Avinash V. Mahajan
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  4. Anupam
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  5. Zakir Hossain
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Correspondence to Tusharkanti Dey.

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Dey, T., Khuntia, P., Mahajan, A.V. et al. 75As NMR local probe study of magnetism in (Eu1−xKx)Fe2As2 . Eur. Phys. J. B 86, 458 (2013). https://doi.org/10.1140/epjb/e2013-40483-6

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  • DOI: https://doi.org/10.1140/epjb/e2013-40483-6

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