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ЖЭТФ, Том 120, Вып. 3, стр. 700 (Сентябрь 2001)
(Английский перевод - JETP, Vol. 93, No 3, p. 615, September 2001 доступен on-line на www.springer.com )

SUPERCONDUCTIVITY IN Ba1-xKxBiO3: POSSIBLE SCENARIO OF SPATIALLY SEPARATED FERMI-BOSE MIXTURE
Menushenkov A.P., Klementev K.V., Kuznetsov A.V., Kagan M.Yu.

Поступила в редакцию: 16 Марта 2001

PACS: 74.20.Mn, 74.72.Yg

DJVU (155.7K) PDF (397.6K)

We propose a new scenario for the metal-insulator phase transition and superconductivity in the perovskite-like bismuthates Ba1-xKxBiO3 (BKBO) based on our EXAFS studies. We show that two types of charge carriers, the local pairs (real-space bosons) and the itinerant electrons, exist in the metallic compound Ba1-xKxBiO3 (x\geq0.37). The real-space bosons are responsible for the charge transport in semiconducting BaBiO3 and for superconductivity in the metallic BKBO. The appearance of the Fermi-liquid state as the percolation threshold is overcome (x\geq0.37) explains the observed metal-insulator phase transition. Because bosons and fermions occupy different types of the octahedral BiO6 complexes, they are separated in real space, and therefore, the spatially separated Fermi-Bose mixture of a new type is likely to be realized in the bismuthates. The nature of superconductivity is consistently explained in the framework of this scenario. A new superconducting oxide Ba1-xLaxPbO3 has been successfully synthesized to check our conclusions.

 
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