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| Hauptverfasser: | , , , , , , , |
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| Format: | Preprint |
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2025
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| Online-Zugang: | https://arxiv.org/abs/2508.10080 |
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| _version_ | 1866912772247257088 |
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| author | Yan, Jiaqiang Singh, David Saparov, Bayram Cao, Huibo Feng, Yejun Cheng, Jinguang Uwatoko, Yoshia Mandrus, David |
| author_facet | Yan, Jiaqiang Singh, David Saparov, Bayram Cao, Huibo Feng, Yejun Cheng, Jinguang Uwatoko, Yoshia Mandrus, David |
| contents | Here we report a structural phase transition and its possible competition with superconductivity in the suboxide La$_5$Pb$_3$O. Upon cooling through $T_t$ = 225 K, La$_5$Pb$_3$O transforms from a high-temperature I4/mcm to a low-temperature P4/ncc structure in which La - Pb dimerization along the c-axis occurs. This transition is accompanied by anomalies in the temperature dependence of electrical resistivity and specific heat. High-pressure electrical transport measurements reveal that hydrostatic pressure suppresses the structural transition and possibly induces superconductivity with a maximum superconducting temperature of 10 K. Density functional theory calculations show minimal changes in the electronic density of states and no gap opening at $E_F$ across $T_t$, suggesting that the transition is driven by bonding effects rather than Fermi surface instability. These findings establish La$_5$Pb$_3$O as a promising platform for exploring the interplay between weak structural transitions and superconductivity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_10080 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Structural transition and possible pressure-induced superconductivity in a suboxide La$_5$Pb$_3$O Yan, Jiaqiang Singh, David Saparov, Bayram Cao, Huibo Feng, Yejun Cheng, Jinguang Uwatoko, Yoshia Mandrus, David Superconductivity Materials Science Here we report a structural phase transition and its possible competition with superconductivity in the suboxide La$_5$Pb$_3$O. Upon cooling through $T_t$ = 225 K, La$_5$Pb$_3$O transforms from a high-temperature I4/mcm to a low-temperature P4/ncc structure in which La - Pb dimerization along the c-axis occurs. This transition is accompanied by anomalies in the temperature dependence of electrical resistivity and specific heat. High-pressure electrical transport measurements reveal that hydrostatic pressure suppresses the structural transition and possibly induces superconductivity with a maximum superconducting temperature of 10 K. Density functional theory calculations show minimal changes in the electronic density of states and no gap opening at $E_F$ across $T_t$, suggesting that the transition is driven by bonding effects rather than Fermi surface instability. These findings establish La$_5$Pb$_3$O as a promising platform for exploring the interplay between weak structural transitions and superconductivity. |
| title | Structural transition and possible pressure-induced superconductivity in a suboxide La$_5$Pb$_3$O |
| topic | Superconductivity Materials Science |
| url | https://arxiv.org/abs/2508.10080 |