Non-resonant Microwave Absorption and Boundary Current Response of Ba0.34K0.64Fe2As2 Superconducting Single Crystals


Boundary current response of Ba0.34K0.64Fe2As2 (BaK122) single crystals was probed by non-resonant microwave absorption (NRMA) as a function of 100-KHz modulation field at an intermediate temperature, namely, 25 K, which is 10 K below the actual Tc. The measurements were done for both field parallel and perpendicular to the iron arsenide plane configuration. A weak anisotropic effect is noted. However, it is observed that the boundary current response depends on the modulation field value and it increases as we increase the modulation field value from 1 to 9 G. Further, this boundary current response strongly depends on the microwave power. We have shown that these modulation field and microwave power dependence of the boundary current response of NRMA signals in BaK122 iron arsenide crystal can be qualitatively understood through the Dulcic model.

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  1. 1.

    Rotter, M., Tegel, M., Johrendt, D.: Phys. Rev. Lett. 107006, 101 (2008)

    Google Scholar 

  2. 2.

    Bhat, S.V., Ganguly, P., Ramakrishnan, T.V., Rao, C.N.R.: J. Phys. C. 20, L559 (1987)

    ADS  Article  Google Scholar 

  3. 3.

    Blazey, K.W., Muller, K.A., Bednorz, J.G., Berlinger, W., Amoretti, G., Buluggiu, E., Vera, A., Matacotta, F.C.: Phys. Rev. B. 36, 7241 (1987)

    ADS  Article  Google Scholar 

  4. 4.

    Kachaturyan, K., Weber, E.R., Tejedor, P., Stacy, A.M., Portis, A.M.: Phys. Rev. B. 36, 8309 (1987)

    ADS  Article  Google Scholar 

  5. 5.

    Rettori, C., Davidov, D., Blelaish, I., Feluer, I.: Magnetism and critical fields in the high-TcsuperconductorsYBa2Cu3O7−xSx(x=0, 1): An ESR study. Phys. Rev. B. 36, 4028–4031 (1987)

    ADS  Article  Google Scholar 

  6. 6.

    Durny, R., Hautala, J., Ducharme, S., Lee, B., Symko, O.G., Taylor, P.C., Zhang, D.J., Xu, J.A.: Phys. Rev. B. 36, 2361 (1987)

    ADS  Article  Google Scholar 

  7. 7.

    Stankowski, J., Kahol, P.K., Dalal, N.S., Moodera, J.S.: Possible Josephson oscillations spectra and electron paramagnetic resonance ofCu2+in Y-Ba-Cu-O. Phys. Rev. B. 36, 7126–7128 (1987)

    ADS  Article  Google Scholar 

  8. 8.

    Srinivasu, V.V., Pinto, R., Sasstry, M.D.: Magnetic shielding effects in Ag-doped and pure YBa2Cu3O7 − x thin films probed by non-resonant microwave absorption. Appl. Supercond. 4, 195–201 (1996)

    Article  Google Scholar 

  9. 9.

    Rastogi, A., Srinivasu, V.V., Hedge, M.S., Bhat, S.V.: Surface barrier effects in non-resonant microwave absorption by thin superconducting films of YBa2Cu3O7−δ. Physica C. 234, 229–231 (1994)

    ADS  Article  Google Scholar 

  10. 10.

    Ramashitja, T.C., Srinivasu, V.V., Sankaran, V., Dong, C., Ma, Y.: Boundary Current Response in Ba 0 . 3 4 K 0 . 6 4 Fe2As2 Single Crystal Probed by Non-resonant Microwave Absorption. J. Supercond. Nov. Magn. 30, 3581–3585 (2017)

    Article  Google Scholar 

  11. 11.

    Ramashitja T.C., Srinivasu V.V., Sankaran V., Raghu A.V: International Journal of Advance Research and Innovative Ideas in Education, ISSN 2395–4396 Vol-1, p. 176 (2016)

  12. 12.

    Srinivasu, V.V., Thomas, B., Hegde, M.S., Bhat, S.V.: Line shapes of field‐dependent nonresonant microwave and rf absorption in high‐Tcsuperconductors. J. Appl. Phys. 75, 4131–4136 (1994)

    ADS  Article  Google Scholar 

  13. 13.

    Bhat, S.V., Srinivasu, V.V., Kumar, N.: Temperature-dependent phase reversal of nonresonant microwave and rf absorption in high-Tcsuperconductors. Phys. Rev. B. 44, 10121–10125 (1991)

    ADS  Article  Google Scholar 

  14. 14.

    Braunisch, W., Knauf, N., Kataev, V., Neuhausen, S., Grutz, A., Kock, A., Roden, B., Khomskii, D., Wohlleben, D.: Paramagnetic Meissner effect in Bi high-temperature superconductors. Phys. Rev. Lett. 68, 1908–1911 (1992)

    ADS  Article  Google Scholar 

  15. 15.

    Khairullin, I.I., Khabibullaev, P.K., Yu, V., Sokolov, A.A., Zakhidov, T.R.: J. Phys. 23, 1107–1126 (1999)

    Google Scholar 

  16. 16.

    Shaltiel, D., Krug von Nidda, H.A.: Nanosci. Nanotechnol Lett. 3(4), 575–578 (2011)

    Article  Google Scholar 

  17. 17.

    Puri, M., Masiakowski, J., Bear, J., Kevan, L.: Effect of density, magnetic field modulation and magnetic field penetration depth on the microwave absorption properties of YBa2Cu3O7 –δsuperconductors. J. Chem. Soc. Faraday Trans. 87(22), 3687–3694 (1991)

    Article  Google Scholar 

  18. 18.

    Wang, C., Gao, Z., Yao, C., Wang, L., Qi, Y., Wang, D., Zhang, X., Ma, Y.: Supercond. Sci. Technol. 24, 065002 (2011)

    ADS  Article  Google Scholar 

  19. 19.

    Dulcic, A., Rakvin, B., Pozek, M.: Mechanisms of Field-Dependent Microwave Absorption in High-TcCeramic Superconductors. Europhysics. Lett. 10(6), 593–598 (1989)

    ADS  Article  Google Scholar 

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We acknowledge the high-quality BaK122 single crystals from Prof Yanwei Ma’s laboratory, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing, China.


We acknowledge a partial financial support by the UNISA-Research Chair for Superconductivity Technology, UNISA.

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Correspondence to V. V. Srinivasu.

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Ramashitja, T.C., Vallabhapurapu, H.H. & Srinivasu, V.V. Non-resonant Microwave Absorption and Boundary Current Response of Ba0.34K0.64Fe2As2 Superconducting Single Crystals. J Supercond Nov Magn 32, 3077–3080 (2019).

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  • Non resonant microwave absorption (NRMA)
  • Ba0.34K0.64Fe2As2 (BaK122) single crystals
  • Boundary current response
  • Anisotropy
  • Iron arsenide plane