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Superconductivity in MgB2: Phonon modes and influence of carbon doping

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Abstract

Following a brief overview, results of our investigations on phonon modes in MgB2, and superconducting transition in carbon doped MgB2 are presented. The superconducting transition temperature in MgB2 xCx as obtained from susceptibility and resistivity measurements is observed to decrease systematically from 39-4 K forx = 0 to 26 K forx = 0.5. It is shown the changes in lattice volume, as obtained from x-ray diffraction measurements, can account only partially for the observed decrease inT c . The observed variation ofT c with carbon content is seen to correlate with the Debye temperatures, obtained from an analysis of the resistivity data.

Investigation of the phonon modes in MgB2, through infrared absorption measurements indicate three modes at 410,475 and 560 cm-1. The former two are associated with the infrared active modes, and the third component is associated with the Raman mode, that gets activated due to disorder. A study of the temperature dependence of these modes indicates no changes across the superconducting transition. The mode at 560 cm-1 shows a significant hardening and a corresponding decrease in linewidth, with the lowering of temperature, that can been accounted in terms of anharmonicity.

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Authors and Affiliations

  1. Materials Science Division, Indira Gandhi Centre for Atomic Research, 603 102, Kalpakkam, India

    A. Bharathi, Y. Hariharan, Jemima Balaselvi & C. S. Sundar

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  1. A. Bharathi
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  2. Y. Hariharan
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  3. Jemima Balaselvi
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  4. C. S. Sundar
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Bharathi, A., Hariharan, Y., Balaselvi, J. et al. Superconductivity in MgB2: Phonon modes and influence of carbon doping. Sadhana 28, 263–272 (2003). https://doi.org/10.1007/BF02717136

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