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Visualization of the magnetic flux structure in phosphorus-doped EuFe2As2 single crystals

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Abstract

Magnetic flux structure on the surface of EuFe2(As1-x P x )2 single crystals with nearly optimal phosphorus doping levels x = 0.20 and x = 0.21 is studied by low-temperature magnetic force microscopy and decoration with ferromagnetic nanoparticles. The studies are performed in a broad temperature range. It is shown that the single crystal with x = 0.21 in the temperature range between the critical temperatures T SC= 22 K and T C = (18 ± 0.3) K of the superconducting and ferromagnetic phase transitions, respectively, has the vortex structure of a frozen magnetic flux, typical for type-II superconductors. The magnetic domain structure is observed in the superconducting state below T C. The nature of this structure is discussed.

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Authors and Affiliations

  1. Moscow Institute of Physics and Technology (State University), Dolgoprudnyi, Moscow region, 141700, Russia

    I. S. Veshchunov, V. S. Stolyarov, S. Yu. Grebenchuk, D. S. Baranov, I. A. Golovchanskiy & A. A. Golubov

  2. Institute for Solid State Physics, The University of Tokyo, 277-8581, Kashiwa, Japan

    I. S. Veshchunov, V. S. Stolyarov, D. S. Baranov, S. Pyon, Yue Sun & T. Tamegai

  3. Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia

    L. Ya. Vinnikov

  4. Department of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University, 211189, Nanjing, China

    N. Zhou & Z. X. Shi

  5. Department of Physics, Changshu Institute of Technology, Changshu, 215500, People’s Republic of China

    X. F. Xu

  6. Laboratoire de physique et d’etude des materiaux, LPEM-UMR8213/CNRS-ESPCI ParisTech-UPMC, 75005, Paris, France

    D. S. Baranov

  7. National University of Science and Technology MISIS, Moscow, 119049, Russia

    I. A. Golovchanskiy

  8. Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan

    Yue Sun

  9. Department of Physics, Zhejiang University, 310027, Hangzhou, China

    Wenhe Jiao & Guanghan Cao

  10. Faculty of Science and Technology and MESA+ Institute of Nanotechnology, University of Twente, 7500 AE, Enschede, The Netherlands

    A. A. Golubov

Authors
  1. I. S. Veshchunov
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  2. L. Ya. Vinnikov
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  3. V. S. Stolyarov
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  4. N. Zhou
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  5. Z. X. Shi
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  6. X. F. Xu
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  7. S. Yu. Grebenchuk
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  8. D. S. Baranov
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  9. I. A. Golovchanskiy
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  10. S. Pyon
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  11. Yue Sun
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  12. Wenhe Jiao
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  13. Guanghan Cao
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  14. T. Tamegai
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  15. A. A. Golubov
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Corresponding author

Correspondence to L. Ya. Vinnikov.

Additional information

Original Russian Text © I.S. Veshchunov, L.Ya. Vinnikov, V.S. Stolyarov, N. Zhou, Z.X. Shi, X.F. Xu, S.Yu. Grebenchuk, D.S. Baranov, I.A. Golovchanskiy, S. Pyon, Yue Sun, Wenhe Jiao, Guanghan Cao, T. Tamegai, A.A. Golubov, 2017, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2017, Vol. 105, No. 2, pp. 87–92.

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Veshchunov, I.S., Vinnikov, L.Y., Stolyarov, V.S. et al. Visualization of the magnetic flux structure in phosphorus-doped EuFe2As2 single crystals. Jetp Lett. 105, 98–102 (2017). https://doi.org/10.1134/S0021364017020151

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  • DOI: https://doi.org/10.1134/S0021364017020151

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