Structural transition and possible pressure-induced superconductivity in a suboxide La5Pb3O
Jiaqiang Yan, David J. Singh, Bayram Saparov, Huibo Cao, Yejun Feng, Jinguang Cheng, Yoshia Uwatoko, David Mandrus
DOI 10.1103/jhbz-8jt4 · Physical Review Materials
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Abstract
Here we report a structural phase transition and its interplay with superconductivity in the suboxide La5Pb3O. Upon cooling through Tt=225K,La5Pb3O 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 EF across Tt, suggesting that the transition is driven by bonding effects rather than Fermi surface instability. These findings establish La5Pb3O as a promising platform for exploring the interplay between weak structural transitions and superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La5Pb3O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | 8 GPa | onset |
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