Fermi-Bose Mixture in Ba(K)BiO3 Superconducting Oxide
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- 作者：A. P. Menushenkov ; A. V. Kuznetsov…
- 刊名：Journal of Superconductivity Incorporating Novel Magnetism
- 出版年：2016
- 出版时间：March 2016
- 年：2016
- 卷：29
- 期：3
- 页码：701-705
- 全文大小：415 KB
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- 作者单位：A. P. Menushenkov (1) <br> A. V. Kuznetsov (1) <br> K. V. Klementiev (2) <br> M. Yu. Kagan (3) <br><br>1. National Research Nuclear University MEPhI (Moscow State Engineering Physics Institute), Kashirskoe shosse 31, 115409, Moscow, Russia <br> 2. MAX IV Laboratory, 225 92, Lund, Sweden <br> 3. P. L. Kapitza Institute for Physical Problems, Kosygin Str. 2, 117334, Moscow, Russia <br>
- 刊物类别：Physics and Astronomy
- 刊物主题：Physics<br>Superconductivity, Superfluidity and Quantum Fluids<br>Magnetism and Magnetic Materials<br>Condensed Matter<br>Characterization and Evaluation Materials<br>
- 出版者：Springer New York
- ISSN：1557-1947
文摘
We have demonstrated a new description of local electronic structure in the perovskite-like bismuthates Bab>1−x b> K b> x b>BiOb>3 b> (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 Bab>1−x b> K b> x b>BiOb>3 b> (x ≥ 0.37). The real-space bosons are responsible for both charge transport in semiconducting BaBiOb>3 b> 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 BiOb>6 b> 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.