Study on superconductivity in SC and AsC MAX phases at various pressures

$$ SC and $$ AsC are among the identified superconducting MAX phases, both exhibiting a transition temperature $$ lower than 10 K. These compounds appear to belong to the conventional class of superconductors. By calculating the electron-phonon couplings of these materials, we have found that the predicted transition temperatures are approximately 6 K for $$ SC and 2 K for $$ AsC, closely matching the experimental findings. However, when subjected to pressure or strain, $$ SC and $$ AsC exhibit contrasting behaviors. While the transition temperature of $$ SC can be doubled by applying pressure up to 50 GPa, the transition temperature of $$ AsC significantly decreases under the same pressure. On the other hand, in the case of $$ AsC, a uniaxial tensile strain of approximately 2% along the c direction can enhance the compound's transition temperature by about 40%. These results show that with the right pressure or strain, it is possible to increase superconducting transition temperature in the $$ AC compounds.