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Investigation of the Upper Critical Magnetic Field and Activation Energy in MgB2 Thin Film

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Abstract

MgB2 film with a thickness of about 600 nm was deposited on the MgO (100) single crystal substrate using a “two-step” synthesis technique. First, deposition of boron thin film was carried out by rf magnetron sputtering on MgO substrates and followed by a post deposition annealing at 850 °C in magnesium vapor. The upper critical field H c2 has been estimated from temperature dependences of resistivity curves in both directions of the magnetic fields perpendicular and parallel to the c-axis. Resistivity measurements of the film were performed using a standard four-probe method under different magnetic fields up to 70 kOe in zero fields cooling regime. The upper critical magnetic field H c2(0) at T=0 K for 90 % of R n was calculated by the extrapolation H c2(T) to the temperature T=0 K. The results showed that H c2∥ab(0) and H c2∥c(0) was found to be around 22 T and 18 T, respectively. Using extracted data, the zero-temperature coherence lengths and field anisotropy ratio were calculated. In order to determine the activation energy of thermally activated flux flow of the film, Arrhenius law was taken into account.

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Acknowledgements

All the authors would like to thank Professor M. Altunbaş (at Karadeniz Technical University, Trabzon, Turkey) for his assistance in terms of editing English language and grammar. This work was supported by the Council of Higher Education (Turkey) and Scientific Research Coordination Unit of Karadeniz Technical University (contract number: 2010.111.001.2).

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Authors and Affiliations

  1. Physics Department, Karadeniz Technical University, Trabzon, 61080, Turkey

    E. Taylan Koparan & E. Yanmaz

  2. Institute of Electronic Engineering and Industrial Technologies ASM, MD2028, Chisinau, Republic of Moldova

    A. Surdu & A. Sidorenko

Authors
  1. E. Taylan Koparan
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  2. A. Surdu
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  3. A. Sidorenko
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  4. E. Yanmaz
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Correspondence to E. Taylan Koparan.

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Taylan Koparan, E., Surdu, A., Sidorenko, A. et al. Investigation of the Upper Critical Magnetic Field and Activation Energy in MgB2 Thin Film. J Supercond Nov Magn 25, 2235–2238 (2012). https://doi.org/10.1007/s10948-012-1605-2

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  • DOI: https://doi.org/10.1007/s10948-012-1605-2

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