Debye temperature, electron-phonon coupling constant, and three-dome shape of crystalline strain as a function of pressure in highly compressed La$_3$Ni$_2$O$_{7-δ}$
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| Format: | Preprint |
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2024
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| _version_ | 1866909319499350016 |
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| author | Talantsev, E. F. Chistyakov, V. V. |
| author_facet | Talantsev, E. F. Chistyakov, V. V. |
| contents | Besides ongoing studies of phase structural transitions, pairing mechanism, and physical properties of recently discovered highly compressed high-temperature superconductor La$_3$Ni$_2$O$_{7-δ}$, here we explored a possibility for the electron-phonon pairing mechanism as an origin of the superconducting state and determined the microcrystalline strain, $ε(P)$, in high pressure $Fmmm$-phase, and low-pressure $Ammm$-phase of this nickelate. To do this, we analyzed temperature dependent resistance and extracted pressure dependent Debye temperature, $Θ_D(P)$, in La$_3$Ni$_2$O$_{7-δ}$ with an approximate value of $Θ_D(P = 25 GPa) = 550$ $K$. From this we established that the La$_3$Ni$_2$O$_{7-δ}$ is strong-coupled superconductor with the electron-phonon coupling constant $λ_{e-ph}(P=22.4 GPa) = 1.75$. This value is close to $λ_{e-ph} = 1.70$ of ambient pressure superconductors $Nb_3R (R = Sn, Al)$. To address ongoing discussion that the lattice strain can be the origin for the emergence of high-temperature superconductivity in the La$_3$Ni$_2$O$_{7-δ}$, we determined the microcrystalline strain, $0.011 < ε(P)$, in the high-pressure $Fmmm$-phase, and $ε(P) < 0.011$ of low-pressure $Fmmm$-phase. Our analysis showed that $ε(P)$ has three-dome shape in the pressure range of $1.6 GPa < P < 41.2 GPa$. One of these two $ε(P)$ deeps at $P \approx 15 GPa$ coincides with the pressure at which the $Ammm$-phase into the $Fmmm$-phase phase transition occurs. Based on our analysis, we proposed probable condition to observe the zero-resistance state in La$_3$Ni$_2$O$_{7-δ}$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2401_00804 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Debye temperature, electron-phonon coupling constant, and three-dome shape of crystalline strain as a function of pressure in highly compressed La$_3$Ni$_2$O$_{7-δ}$ Talantsev, E. F. Chistyakov, V. V. Superconductivity Besides ongoing studies of phase structural transitions, pairing mechanism, and physical properties of recently discovered highly compressed high-temperature superconductor La$_3$Ni$_2$O$_{7-δ}$, here we explored a possibility for the electron-phonon pairing mechanism as an origin of the superconducting state and determined the microcrystalline strain, $ε(P)$, in high pressure $Fmmm$-phase, and low-pressure $Ammm$-phase of this nickelate. To do this, we analyzed temperature dependent resistance and extracted pressure dependent Debye temperature, $Θ_D(P)$, in La$_3$Ni$_2$O$_{7-δ}$ with an approximate value of $Θ_D(P = 25 GPa) = 550$ $K$. From this we established that the La$_3$Ni$_2$O$_{7-δ}$ is strong-coupled superconductor with the electron-phonon coupling constant $λ_{e-ph}(P=22.4 GPa) = 1.75$. This value is close to $λ_{e-ph} = 1.70$ of ambient pressure superconductors $Nb_3R (R = Sn, Al)$. To address ongoing discussion that the lattice strain can be the origin for the emergence of high-temperature superconductivity in the La$_3$Ni$_2$O$_{7-δ}$, we determined the microcrystalline strain, $0.011 < ε(P)$, in the high-pressure $Fmmm$-phase, and $ε(P) < 0.011$ of low-pressure $Fmmm$-phase. Our analysis showed that $ε(P)$ has three-dome shape in the pressure range of $1.6 GPa < P < 41.2 GPa$. One of these two $ε(P)$ deeps at $P \approx 15 GPa$ coincides with the pressure at which the $Ammm$-phase into the $Fmmm$-phase phase transition occurs. Based on our analysis, we proposed probable condition to observe the zero-resistance state in La$_3$Ni$_2$O$_{7-δ}$. |
| title | Debye temperature, electron-phonon coupling constant, and three-dome shape of crystalline strain as a function of pressure in highly compressed La$_3$Ni$_2$O$_{7-δ}$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2401.00804 |