Superconductivity above 20 K in the Ba-K-Bi-O system

L. F. Mattheiss; E. M. Gyorgy; D. W. Johnson, Jr.

doi:10.1103/PhysRevB.37.3745

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Superconductivity above 20 K in the Ba-K-Bi-O system

L. F. Mattheiss, E. M. Gyorgy, D. W. Johnson, Jr.

DOI 10.1103/PhysRevB.37.3745 · Physical Review B

T1

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Abstract

The results of magnetic susceptibility measurements on multiphase Ba-K-Bi-O samples with overall composition Ba0.9KxBiO3 (x≊0.2) provide evidence for superconductivity above 20 K in a minority fraction (∼5%) of the sample volume. These results support the expectation that K doping at the inactive Ba donor sites can extend the metallic range of the previously studied BaPb1−xBixO3 alloys closer to the BaBiO3 Peierls instability where the strong coupling of the conduction electrons to the O phonons could explain the enhanced (Tc∼22 vs 13 K) superconducting transition temperatures.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Ba0.9K0.24BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	22	Pressure not reported	onset
Ba0.9K0.2BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	22	Pressure not reported	onset
Ba0.9Rb0.2BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15	Pressure not reported	onset
BaPb1-xBixO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	13	Pressure not reported	unknown