Skip to main content
SpringerLink
Log in

Multiple Andreev Reflection Effect Spectroscopy of Underdoped NaFe1 – xCoxAs Single Crystals

  • CONDENSED MATTER
  • Published:
JETP Letters Aims and scope Submit manuscript

We study the structure of the superconducting order parameter in underdoped NaFe1 – xCoxAs pnictides with Tc ≈ 19–21 K related to the 111 family. Using incoherent multiple Andreev reflection effect spectroscopy of planar break junctions, we directly determine the magnitudes of the two microscopic superconducting order parameters: the small superconducting gap ΔS(0), and possible edges of the large gap ΔL(0) having an anisotropy in the \(ab\) plane at T ≪ Tc, the corresponding characteristic ratios, as well as their temperature dependences. Additionally, we detect features of the tunneling \(dI(V){\text{/}}dV\) spectra in NaFe1 – xCoxAs at \(eV\text{*} > 2{{\Delta }_{{\text{L}}}}(0)\), those irrelative to superconducting state, and discuss their origin.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1.
Fig. 2.
Fig. 3.
Fig. 4.
Fig. 5.

Similar content being viewed by others

REFERENCES

  1. T. E. Kuzmicheva and S. A. Kuzmichev, JETP Lett. 114, 630 (2021).

    Article  ADS  Google Scholar 

  2. M. D. Watson, S. Aswartham, L. C. Rhodes, B. Parrett, H. Iwasawa, M. Hoesch, I. Morozov, B. Büchner, and T. K. Kim, Phys. Rev. B 97, 035134 (2018).

  3. Q. Q. Ge, Z. R. Ye, M. Xu, Y. Zhang, J. Jiang, B. P. Xie, Y. Song, C. L. Zhang, P. Dai, and D. L. Feng, Phys. Rev. X 3, 011020 (2013).

  4. J. Moreland and J. W. Ekin, J. Appl. Phys. 58, 3888 (1985).

    Article  ADS  Google Scholar 

  5. S. A. Kuzmichev and T. E. Kuzmicheva, Low Temp. Phys. 42, 1008 (2016).

    Article  ADS  Google Scholar 

  6. Z. Popovic, S. A. Kuzmichev, and T. E. Kuzmicheva, J. Appl. Phys. 128, 013901 (2020).

  7. I. Giaever and K. Megerle, Phys. Rev. 122, 1101 (1961).

    Article  ADS  Google Scholar 

  8. M. Octavio, M. Tinkham, G. E. Blonder, and T. M. Klapwijk, Phys. Rev. B 27, 6739 (1983).

    Article  ADS  Google Scholar 

  9. R. Kümmel, U. Gunsenheimer, and R. Nicolsky, Phys. Rev. B 42, 3992 (1990).

    Article  ADS  Google Scholar 

  10. D. Averin and A. Bardas, Phys. Rev. Lett. 75, 1831 (1995).

    Article  ADS  Google Scholar 

  11. T. P. Devereaux and P. Fulde, Phys. Rev. B 47, 14638 (1993).

    Article  ADS  Google Scholar 

  12. I. K. Yanson, Sov. Phys. JETP 39, 506 (1974).

    ADS  Google Scholar 

  13. T. E. Kuzmicheva, S. A. Kuzmichev, I. V. Morozov, S. Wurmehl, and B. Büchner, JETP Lett. 111, 350 (2020).

    Article  ADS  Google Scholar 

  14. S. Kuzmichev, T. Kuzmicheva, I. Morozov, A. Boltalin, and A. Shilov, SN Appl. Sci. 4, 189 (2022).

    Google Scholar 

  15. T. E. Kuzmicheva, S. A. Kuzmichev, K. S. Pervakov, and V. A. Vlasenko, JETP Lett. 112, 786 (2020).

    Article  ADS  Google Scholar 

  16. T. E. Kuzmicheva, S. A. Kuzmichev, K. S. Pervakov, and V. A. Vlasenko, Phys. Rev. B 104, 174512 (2021).

  17. A. V. Sadakov, A. V. Muratov, S. A. Kuzmichev, O. A. Sobolevskiy, B. I. Massalimov, A. R. Prishchepa, V. M. Mikhailov, K. S. Pervakov, V. A. Vlasenko, and T. E. Kuzmicheva, JETP Lett. 116, 708 (2022).

    Article  ADS  Google Scholar 

  18. S. A. Kuzmichev, K. S. Pervakov, V. A. Vlasenko, A. Yu. Degtyarenko, S. Yu. Gavrilkin, and T. E. Kuzmicheva, JETP Lett. 116, 723 (2022).

    Article  ADS  Google Scholar 

Download references

ACKNOWLEGMENTS

The work was partly carried out using the research equipment of the Shared Facility Center, Lebedev Physical Institute, Russian Academy of Sciences.

Funding

The work was supported by Russian Science Foundation project no. 22-72-10082.

Author information

Authors and Affiliations

  1. Faculty of Physics, Moscow State University, 119991, Moscow, Russia

    S. A. Kuzmichev

  2. Lebedev Physical Institute, Russian Academy of Sciences, 119991, Moscow, Russia

    S. A. Kuzmichev, A. I. Shilov, E. O. Rakhmanov & T. E. Kuzmicheva

  3. Faculty of Chemistry, Moscow State University, 119991, Moscow, Russia

    I. V. Morozov & E. O. Rakhmanov

Authors
  1. S. A. Kuzmichev
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. I. V. Morozov
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. A. I. Shilov
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. E. O. Rakhmanov
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. T. E. Kuzmicheva
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to T. E. Kuzmicheva.

Ethics declarations

The authors declare that they have no conflicts of interest.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Kuzmichev, S.A., Morozov, I.V., Shilov, A.I. et al. Multiple Andreev Reflection Effect Spectroscopy of Underdoped NaFe1 – xCoxAs Single Crystals. Jetp Lett. 117, 612–617 (2023). https://doi.org/10.1134/S0021364023600751

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1134/S0021364023600751

Search

Navigation