Raman Studies in MgB2-xCx
T. Sakuntala, S. K. Deb, A. Bharathi, S. Jemima Balaselvi, C. S., Sundar, Y. Hariharan
TL;DR
This study investigates how carbon substitution affects the vibrational properties and superconducting transition temperature of MgB2 through Raman scattering, revealing mode changes and new bands with increasing carbon content.
Contribution
It provides detailed Raman spectral analysis of MgB2-xCx, highlighting mode shifts, new band appearances, and their correlation with superconducting properties, which is novel.
Findings
Broad Raman band narrows and decreases in intensity with more carbon
New bands appear at 1200 cm-1 for x>0.15, indicating B-C modes
Superconducting transition temperature decreases with carbon substitution
Abstract
Raman scattering measurements have been carried out in MgB2-xCx for x=0.0 -0.30. The broad Raman band around 600cm-1 range, which corresponds to the E2g mode in MgB2 is seen to narrow and reduce in intensity with increasing carbon content. For x>0.15, new set of bands appear at 1200 cm-1 possibly arising from the B-C, E2g modes. The decrease in Tc with carbon substitution seems to correlate with this change over.
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Taxonomy
TopicsSuperconductivity in MgB2 and Alloys · Physics of Superconductivity and Magnetism · Boron and Carbon Nanomaterials Research