Polymorphism in BaPb1−xBixO3 at the superconducting composition

E. Climent-Pascual; N. Ni; S. Jia; Q. Huang; R. J. Cava

doi:10.1103/PhysRevB.83.174512

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Polymorphism in BaPb1−xBixO3 at the superconducting composition

E. Climent-Pascual, N. Ni, S. Jia, Q. Huang, R. J. Cava

DOI 10.1103/PhysRevB.83.174512 · Physical Review B

T1

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Abstract

Using a combination of high-resolution and high-sensitivity neutron and x-ray diffraction measurements, it is shown that BaPb1−xBixO3 is dimorphic for the critical superconducting composition regime of x between 0.2 and 0.3. The system is not chemically phase separated; the simultaneous existence of tetragonal and orthorhombic polymorphs of the same composition is demonstrated. The polymorphs differ fundamentally in the distortion and tilting of the octahedra, such that they cannot be obtained from each other via a second-order phase transition. It is established that the tetragonal symmetry polymorph is the superconducting phase.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
BaPb1-xBixO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	13	Pressure not reported	onset