Einstein and Debye Temperatures, Electron-Phonon Coupling Constant and a Probable Mechanism for Ambient-Pressure Room-Temperature Superconductivity in Intercalated Graphite

Recently, Ksenofontov et al. (arXiv:2510.03256) observed ambient pressure room-temperature superconductivity in graphite intercalated with lithium-based alloys with transition temperature (according to magnetization measurements) \( T_{c} =330K \). Here, I analyzed the reported temperature dependent resistivity data \( \rho(T) \) in these graphite-intercalated samples and found that \( \rho(T) \) is well described by the model of two series resistors, where each resistor is described as either an Einstein conductor or a Bloch-Grüneisen conductor. Deduced Einstein and Debye temperatures are \( \Theta_{E,1} \approx 250~\text{K} \) and \( \quad \Theta_{E,2} \approx 1600~\text{K} \), and \( \quad \Theta_{D,1} \approx 300~\text{K} \) and \( \quad \Theta_{D,2} \approx 2200~\text{K} \), respectively. Following the McMillan formalism, from the deduced \( \quad \Theta_{E,2} \) and \( \quad \Theta_{D,2} \), the electron-phonon coupling constant \( \lambda_{e-ph} \approx 2.2 \) was obtained. This value of \( \lambda_{e-ph} \) is approximately equal to the value of \( \lambda_{e-ph} \) in highly compressed superconducting hydrides. Based on this, I can propose that the observed room-temperature superconductivity in intercalated graphite is localized in nanoscale Sr-Ca-Li metallic flakes/particles, which adopt the phonon spectrum from the surrounding bulk graphite matrix, and as a result, conventional electron-phonon superconductivity arises in these nano-flakes/particles at room temperature. Experimental data reported by Ksenofontov et al. (arXiv:2510.03256) on trapped magnetic flux decay in intercalated graphite samples supports the proposition.