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

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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.

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Authors and Affiliations

  1. National Research Nuclear University MEPhI (Moscow State Engineering Physics Institute), Kashirskoe shosse 31, 115409, Moscow, Russia

    A. P. Menushenkov & A. V. Kuznetsov

  2. MAX IV Laboratory, 225 92, Lund, Sweden

    K. V. Klementiev

  3. P. L. Kapitza Institute for Physical Problems, Kosygin Str. 2, 117334, Moscow, Russia

    M. Yu. Kagan

Authors
  1. A. P. Menushenkov
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  2. A. V. Kuznetsov
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  3. K. V. Klementiev
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  4. M. Yu. Kagan
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Corresponding author

Correspondence to A. P. Menushenkov.

Additional information

This work was supported by Russian Science Foundation (Grant No 14-22-00098)

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Menushenkov, A.P., Kuznetsov, A.V., Klementiev, K.V. et al. Fermi-Bose Mixture in Ba(K)BiO3 Superconducting Oxide. J Supercond Nov Magn 29, 701–705 (2016). https://doi.org/10.1007/s10948-015-3295-z

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  • DOI: https://doi.org/10.1007/s10948-015-3295-z

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