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Higher harmonics of the ac-susceptibility for pristine MgB2 superconductor variation with ac-field and frequency: analysis of irreversibility line

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Abstract

The fundamental and 3rd harmonic real and imaginary ac-susceptibilities as a function of temperature were measured individually with a varying ac-drive field (Hac = 5, 15, 25, and 35 Oe) and with varying frequency (f = 1000, 1500, 2000, and 3000 Hz) for pure MgB2 sample. The peaks amplitude is enhancing slightly in imaginary ac-susceptibility component for fundamental and 3rd harmonic case with the increase of ac-field and frequency separately and shifted towards the lower temperature side. The amplitude of the peaks of imaginary 3rd harmonic ac-susceptibility shows contraction than that of the fundamental harmonic ac-susceptibility in both the variation, ac-field, and frequency. The 3rd harmonic in-phase component reveals the sinusoidal excitations in both the cases, with varying ac-field and frequency, separately. The magnetic irreversibility line (IL) is shifted towards the higher temperature region in all the cases studied here. The Neel–Arrhenius (N–A) model completely explained the dynamics flux behavior of the strongly interacting magnetic particles. The inverse freezing temperature is dropping with the increase of the frequency in ln (1/f) versus Tf plot.

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Acknowledgements

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

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  1. Physics Division, Department of General Studies, Jubail Industrial College, P. O. Box - 10099, Jubail Industrial City, 31961, Saudi Arabia

    Intikhab A. Ansari

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Ansari, I.A. Higher harmonics of the ac-susceptibility for pristine MgB2 superconductor variation with ac-field and frequency: analysis of irreversibility line. J Mater Sci: Mater Electron 34, 196 (2023). https://doi.org/10.1007/s10854-022-09684-7

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