Fermi-Bose Mixture in Ba(K)BiO3 Superconducting Oxide

  • A. P. Menushenkov
  • A. V. Kuznetsov
  • K. V. Klementiev
  • M. Yu. Kagan
Original Paper
First Online:
Received:
Accepted:

Abstract

We have demonstrated a new description of local electronic structure in the perovskite-like bismuthates Ba1−x K x BiO3 (BKBO) based on existence of the spatially separated Fermi-Bose mixture. We have shown that two types of charge carriers: the local electron pairs (real-space bosons) and the itinerant electrons exist in metallic compound Ba1−x K x BiO3 (x ≥ 0.37). The real-space bosons are responsible for both charge transport in semiconducting BaBiO3 and superconductivity in metallic BKBO, while the fermionic subsystem is responsible for the observed metal-insulator phase transition and appearance of the Fermi-liquid state when the percolation threshold is overcome (x ≥ 0.37). Bosons and fermions occupy different types of the octahedral BiO6 complexes, so they are separated in real space. This scenario fits well into a new quantum state of pair-density wave (PDW), actively discussed for copper-based HTSC.

Keywords

Local Pair Octahedral Complex Local Electronic Structure Nd2CuO4 Neighboring Octahedra 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • A. P. Menushenkov
    • 1
  • A. V. Kuznetsov
    • 1
  • K. V. Klementiev
    • 2
  • M. Yu. Kagan
    • 3
  1. 1.National Research Nuclear University MEPhI (Moscow State Engineering Physics Institute)MoscowRussia
  2. 2.MAX IV LaboratoryLundSweden
  3. 3.P. L. Kapitza Institute for Physical ProblemsMoscowRussia

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