Metastable behavior of the superconducting phase in the BaBi1−xPbxO3 system
D. T. Marx, P. G. Radaelli, J. D. Jorgensen, R. L. Hitterman, D. G. Hinks, Shiyou Pei, B. Dabrowski
DOI 10.1103/PhysRevB.46.1144 · Physical Review B
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Abstract
The structural phases of the BaBi1−xPbxO3 system have been studied using neutron powder diffraction. As lead is substituted on the bismuth site, the room-temperature structure is monoclinic for 0.00≤x≤0.20, orthorhombic for 0.25≤x≤0.65, diphasic (orthorhombic and tetragonal) for 0.70≤x≤0.80, and monoclinic for x=1.0. Superconductivity is observed for samples in the composition range 0.70≤x≤0.80. The superconducting phase is the tetragonal phase. In situ neutron-powder-diffraction measurements versus temperature show that it is not stable at temperatures below about 425 K. All superconducting samples consist of the metastable tetragonal phase and a semiconducting orthorhombic phase because the tetragonal-to-orthorhombic transition does not proceed to completion. Samples of Ba1−yKyBi1−xPbxO3 have Tc’s that are inversely proportional to the total dopant concentration, x+y, in the composition region (0.5≤x+y≤0.9), where the material is metallic.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaBi1-xPbxO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13 | Pressure not reported | unknown |
| Ba1-yKyBi1-xPbxO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Ba1-xKxBiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
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