Metastable behavior of the superconducting phase in the BaBi1-xPbxO3 system.

Journal article

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 0.00x0.20, orthorhombic for 0.25x0.65, diphasic (orthorhombic and tetragonal) for 0.70x0.80, and monoclinic for x=1.0. Superconductivity is observed for samples in the composition range 0.70x0.80. 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 Tcs that are inversely proportional to the total dopant concentration, x+y, in the composition region (0.5x+y0.9), where the material is metallic. © 1992 The American Physical Society.

Authors: Marx, D; Radaelli, P; Jorgensen, J; Hitterman, R; Hinks, D

• Publication status: Published
• Journal: Physical review. B, Condensed matter
• Volume: 46
• Issue: 2
• Pages: 1144-1156
• Publication date: 1992-07-01
• DOI: 10.1103/physrevb.46.1144
• EISSN: 1095-3795
• ISSN: 0163-1829
• Language: English