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Title: Phase stability, electronic structures, and superconductivity properties of the BaPb1-xBixO3 and Ba1-xKx BiO3 perovskites

Journal Article · · Journal of the American Ceramic Society
DOI:https://doi.org/10.1111/jace.14605· OSTI ID:1524044
 [1];  [1];  [2];  [1];  [3];  [3];  [4];  [3]
  1. Tianjin Normal Univ., Tianjin (China). College of Physics and Materials Science
  2. Zhejiang Normal Univ., Jinhua Zhejiang (China). Inst. of Information Optics
  3. Univ. of Tulsa, Tulsa, OK (United States). Dept. of Physics and Engineering Physics
  4. City Univ. of Hong Kong (Hong Kong). Dept. of Mechanical and Biomedical Engineering

With extensive first-principles calculations, we investigate the phase stability,electronic structures, and superconductivity properties of the BaPb1-xBixO3 (BPBO) and Ba1-xKxBiO3(BKBO) perovskites with the cubic (C), tetragonal (T), and orthorhombic (O) phases. Our calculations show that the tetragonal superconducting phases of both perovskites are metastable. However, the orthorhombicphase of the BPBO perovskite in the superconductivity region is only slightly more stable than the tetragonal phase. The small energy difference between the T and O phases and the discontinuous T-to-O phase transition account for the experimentally observed coexistence of the T and O phases. On the other hand, the BKBO perovskite involves a large energy difference between the T and O phases,which induces a low equilibrium temperature of the discontinuous T-to-O phase transition, in agreement with the experimental observation that the tetragonal BKBO is maintained down to low temperatures. Moreover, the electronic structures of both BPBO and BKBO superconductors show a flat band near the Fermi level, which is favorable for superconductivity. Furthermore, we find that the longer the total length of the flat band segment is, the higher the critical temperature of the BPBO or BKBO perovskite is. This key finding could be generalized straightforwardly to other unconventional superconductors and can be used to design and find optimal composition with maximum Tc for new unconventional superconductors.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE
OSTI ID:
1524044
Journal Information:
Journal of the American Ceramic Society, Vol. 100, Issue 3; ISSN 0002-7820
Publisher:
American Ceramic SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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Cited By (4)

Superconductivity in Perovskite Ba 1−x K x Bi 0.30 Pb 0.70 O 3−δ journal March 2019
High-throughput screening of chalcogenide single perovskites by first-principles calculations for photovoltaics journal October 2018
Superconducting properties of under- and over-doped BaxK1−xBiO 3 perovskite oxide journal June 2018
Superconducting properties of under- and over-doped Ba$_{x}$K$_{1-x}$BiO$_{3}$ perovskite oxide text January 2018

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