Bhadauria, P. P. S. and Gupta, Anurag and Kishan, Hari and Sharma, Shivani and Narlikar, A. V. (2017) Band Modification Effect on the Normal and Superconducting State Properties of Bulk MgB2. Journal of Superconductivity and Novel Magnetism, 30 (2). pp. 353-358. ISSN 1557-1939

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Modification of sigma and pi bands was studied in MgB2 by doping 3, 6 and 9 wt% of C and Fe, respectively. The samples synthesized by a solid-state route were characterized by XRD, and magnetization (M) and resistivity (rho) measurements were in the temperature range (T) 4.2-300 K and magnetic field range (B) 0-12 T, respectively. The decrease (increase) of the lattice parameter a with C (Fe) doping, consistent with B (Mg) site substitution, confirms the expected changes in sigma (pi) bands. This is supported by the fact that normal-state rho(T) of all the samples can be fitted by a two-band model and the scattering rates in both the bands are found to be dependent on the dopant. The influence of C and Fe doping on various superconducting properties of the host MgB2 is also found to be significantly different. For instance, in the presence of magnetic field, Fe doping shows a much larger broadening of the superconducting transition when compared to C doping. The critical current density (J (C)(B)) at 4.2 K vanishes for C (Fe) doping at around T similar to 12 (similar to 3). It is shown that the band modification and the superconducting properties are correlated.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Springer Verlag.
Subjects: Applied Physics/Condensed Matter
Depositing User: Users 27 not found.
Date Deposited: 31 May 2019 11:21
Last Modified: 31 May 2019 11:21

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