Einstein and Debye temperatures, electron-phonon coupling constant and a probable mechanism for ambient-pressure room-temperature superconductivity in intercalated graphite
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arXiv
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2025
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| _version_ | 1866917176715247616 |
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| author | Talantsev, E. F. |
| author_facet | Talantsev, E. F. |
| contents | 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) $T_c=330$ $K$. Here, I analyzed the reported temperature dependent resistivity data $ρ(T)$ in these graphite-intercalated samples and found that $ρ(T)$ 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 $Θ_{E,1} \approx 250$ $K$ and $Θ_{E,2} \approx 1,600$ $K$, and $Θ_{D,1} \approx 300$ $K$ and $Θ_{D,2} \approx 2,200$ $K$, respectively. Following the McMillan formalism, from the deduced $Θ_{E,2}$ and $Θ_{D,2}$, the electron-phonon coupling constant $λ_{e-ph} = 2.2 - 2.6$ was obtained. This value of $λ_{e-ph}$ is approximately equal to the value of $λ_{e-ph}$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_07460 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Einstein and Debye temperatures, electron-phonon coupling constant and a probable mechanism for ambient-pressure room-temperature superconductivity in intercalated graphite Talantsev, E. F. General Physics 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) $T_c=330$ $K$. Here, I analyzed the reported temperature dependent resistivity data $ρ(T)$ in these graphite-intercalated samples and found that $ρ(T)$ 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 $Θ_{E,1} \approx 250$ $K$ and $Θ_{E,2} \approx 1,600$ $K$, and $Θ_{D,1} \approx 300$ $K$ and $Θ_{D,2} \approx 2,200$ $K$, respectively. Following the McMillan formalism, from the deduced $Θ_{E,2}$ and $Θ_{D,2}$, the electron-phonon coupling constant $λ_{e-ph} = 2.2 - 2.6$ was obtained. This value of $λ_{e-ph}$ is approximately equal to the value of $λ_{e-ph}$ 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. |
| title | Einstein and Debye temperatures, electron-phonon coupling constant and a probable mechanism for ambient-pressure room-temperature superconductivity in intercalated graphite |
| topic | General Physics |
| url | https://arxiv.org/abs/2511.07460 |