Mohammed Shahabuddin, Nasser S. Alzayed, Niyaz A. Madhar, Salem A. Qaid, Shahid M. Ramay
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引用次数: 0
Abstract
Investigation of the influence of various carbon-based dopants, specifically carbon nanotubes (CNT), glutaric acid, melanin, boron carbide (B₄C), silicon carbide (SiC), and glucose, on the structural and superconducting properties of magnesium diboride (MgB₂) has been studied. The analysis conducted via X-ray diffraction (XRD) revealed modifications in peak positions, which can be attributed to lattice strain, with samples incorporated with melanin demonstrating the most pronounced alterations. This lattice strain led to a reduction in electron density within the σ hole band, consequently exerting a detrimental effect on superconductivity. Resistivity measurements indicate a reduction in the critical temperature (Tc) for all doped samples, with values ranging from 38.1 K (for pure) to 36.8 K (for melanin). Upon the assessment of critical current density (Jc), samples doped with SiC, CNT, glucose, and B4C revealed significant enhancements at a magnetic field of 3 T (operating field of MRI). The highest Jc values were achieved at 7.2 × 104 A/cm2 at 5 K (CNT and GL) and 1.66 × 104 A/cm2 at 20 K for CNT. Collectively, the dopants CNT and SiC provided an optimal balance of lattice strain, grain connectivity, and flux pinning, leading to enhanced superconducting attributes across the comprehensive range of magnetic fields.
期刊介绍:
The Journal of Superconductivity and Novel Magnetism serves as the international forum for the most current research and ideas in these fields. This highly acclaimed journal publishes peer-reviewed original papers, conference proceedings and invited review articles that examine all aspects of the science and technology of superconductivity, including new materials, new mechanisms, basic and technological properties, new phenomena, and small- and large-scale applications. Novel magnetism, which is expanding rapidly, is also featured in the journal. The journal focuses on such areas as spintronics, magnetic semiconductors, properties of magnetic multilayers, magnetoresistive materials and structures, magnetic oxides, etc. Novel superconducting and magnetic materials are complex compounds, and the journal publishes articles related to all aspects their study, such as sample preparation, spectroscopy and transport properties as well as various applications.