Kumar, Anuj and Jha, Rajveer and Tandon, R. P. and Awana, V. P. S. (2012) Effect of Boron substitution on the superconductivity of non-oxide perovskite MgCNi3. Solid State Communications, 152. pp. 1678-1682. ISSN 0038-1098

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We report synthesis, structural and magnetic (DC and AC) properties of Boron substituted MgCNi3 superconductor. A series of polycrystalline bulk samples Mg1.2C1.6-xBxNi3 (x=0.0, 0.08 and 0:16) is synthesized through standard solid-state reaction route, which are found to crystallize in cubic perovskite structure with space group Pm3m. Rietveld analysis of observed XRD data show that lattice parameters expand from a=3.8106 (4) angstrom for pure, to 3.8164 (2) angstrom and 3.8173 (5) angstrom for 5% and 10% Boron substituted samples respectively. DC magnetization exhibited superconducting transition (T-c) at around 7.3 K for pure sample, and the same decreases slightly with Boron substitution. The lower critical field (H-c1) at 2 K is around 150 Oe for pure sample, which increases slightly with Boron substitution. For pure sample the upper critical field (H-c2) being determined from AC susceptibility measurements is 11.6 kOe and 91.70 kOe with 50% and 90% diamagnetism criteria respectively, which decreases to 5.57 kOe and 42.5 kOe respectively for 10% Boron substituted sample. 10% Boron substitution at Carbon site has decreased both the H-c2 and T-c. On the other hand lower critical field (H-c1) at 2 K is slightly increased from around 150 Oe for pure sample, to 200 Oe for 10% Boron substituted sample. Seemingly, the Carbon site Boron substitution induced disorder though has increased slightly the H-c1 but with simultaneous decrease in superconducting transition temperature (T-c) and upper critical field (H-c2). The high relative proportion of Ni in studied MgCNi3 suggests that magnetic interactions are important and non-oxide perovskite structure make it interesting.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Elsevier.
Subjects: Applied Physics/Condensed Matter
Depositing User: Users 27 not found.
Date Deposited: 14 Feb 2020 07:41
Last Modified: 14 Feb 2020 07:41
URI: http://npl.csircentral.net/id/eprint/3636

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