Debye Temperature, Electron-Phonon Coupling Constant, and Moderate Nonadiabaticity in Highly-Compressed I-43d-Tah3 Superconductor

Recently He et al (2022 arXiv 2212.13739) reported on the discovery of high-temperature superconductivity in highly-compressed polyhydride of tantalum. At pressure 𝑃 = 197 𝐺𝑃𝑎 , the polyhydride I-43d -phase of TaH 3 exhibits zero-resistance transition temperature 𝑇 𝑐,𝑧𝑒𝑟𝑜 = 25.6 𝐾 . Measurements of the low-temperature magnetoresistance showed that this superconductor has the ground state upper critical field (defined by the zero resistance criterion) 𝐵 𝑐2 (0) = 11 ± 1 𝑇𝑒𝑠𝑙𝑎. Here, we performed detailed analysis of the reported experimental data by He et al (2022 arXiv 2212.13739) and deduced several parameters of the I-43d -phase of TaH 3 : (a) the Debye temperature, 𝑇 𝜃 = 263 𝐾 , (b) the electron-phonon coupling constant, 𝜆 𝑒−𝑝ℎ = 1.53 ± 0.13 ; (c) the Fermi temperature 𝑇 𝐹 = 1324 ± 74 𝐾 ; (d) the strength of nonadiabaticity, 𝑇 𝜃 𝑇 𝐹 = 0.19 ± 0.01 ; (e) and the ratio of 𝑇 𝑐 𝑇 𝐹 = 0.0185 ± 0.010 which implies that I-43d -phase of TaH 3 falls in unconventional superconductors band in the Uemura plot. Deduced parameters indicate that the I-43d -phase of TaH 3 ( P = 197 GPa) can be classified as typical unconventional high-temperature superconductor.

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