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Vortex dynamics behavior with third harmonic ac-susceptibility for nano Fe-doped MgB2 superconductor

  • Intikhab A. AnsariEmail author
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Abstract

In the present study, the nano Fe-doped MgB2 samples with different doping contents (0 wt% ≤ x ≤ 6 wt%) were synthesized by the solid-state reaction technique. The fundamental and third harmonic real and imaginary components of ac-susceptibility were measured with an ac-applied field of Hac = 0.5 Oe under the different frequency range f = 1–3 kHz. The amplitude of the peaks in the first harmonic imaginary component as a function of temperature, \({\chi ^{\prime\prime}_1}(T)\) plots enhances regularly as we increase the frequency and shifted towards the higher temperature region. The highest amplitude of the peak is shown by 3 wt% doped sample among the undoped and doped sample in \({\chi ^{\prime\prime}_1}(T)\) plot. The χ3″ reveals the sinusoidal oscillation with maxima and minima of the ratio δ, a parameter associated with the penetration depth of the ac-applied field. The amplitude of the real component χ3′ is smaller than the imaginary component of χ3″ in third harmonic ac-susceptibility measurements. The 6 wt% nano-Fe doped MgB2 sample shows the multiple real and imaginary peaks of third harmonic ac-susceptibility, χ3. The irreversibility line (IL) is shifted towards the higher temperature site with the increases of frequency. The slope of the IL increases with the increase of frequency.

Notes

Acknowledgements

This work is supported by the GS Department, Jubail Industrial College (Royal Commission in Jubail) Saudi Arabia.

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of General StudiesJubail Industrial CollegeJubail Industrial CitySaudi Arabia

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