Abstract
We have studied Raman scattering in $\mathrm{Mg}{\mathrm{B}}_{2}$ thin films grown by hybrid physical-chemical vapor deposition on SiC and ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$ substrates. The Cooper-pair-breaking peak corresponding to the larger gap was observed and its position correlates with the value of ${T}_{c}$, which varies with film strain. The temperature dependence of the ${E}_{2g}$ phonon frequency and linewidth was studied. Carbon doping of $\mathrm{Mg}{\mathrm{B}}_{2}$ films suppresses ${T}_{c}$, and leads to a hardening of the ${E}_{2g}$ phonon mode, an increased luminescence background in the spectra, and a stronger contribution of disorder-activated phonons to Raman spectra.
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