Structural distortion in superconducting Ba1−xKxBiO3
M. Braden, W. Reichardt, E. Elkaim, J. P. Lauriat, S. Shiryaev, S. N. Barilo
DOI 10.1103/PhysRevB.62.6708 · Physical Review B
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Abstract
The structure of superconducting Ba1−xKxBiO3 (BKBO) has been studied by neutron and synchrotron diffraction on single crystalline and on powder samples. In contrast to the phase diagram reported by several groups we find a long range structural distortion persisting in the K-concentration range of superconductivity. The distortion is characterized by a tilt of the BiO6 octahedra around the cubic [001] direction, space group I4/mcm, so far not observed for any BKBO compound. The mixing of light monovalent K atoms with the heavier two-valent Ba atoms causes strong structural disorder, in particular for the octahedron tilt. This disorder is simulated within a harmonic lattice dynamical model.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba1-xKxBiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32.5 | Pressure not reported | unknown |
| Ba1-xKxBiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28.5 | Pressure not reported | unknown |
| Ba1-xKxBiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 27 | Pressure not reported | unknown |
| Ba1-xKxBiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 29.5 | Pressure not reported | unknown |
| Ba1-xKxBiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23.1 | Pressure not reported | unknown |
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