Unveiling the Superconducting Mechanism of Ba0.51K0.49BiO3
C. H. P. Wen, H. C. Xu, Q. Yao, R. Peng, X. H. Niu, Q. Y. Chen, Z. T. Liu, D. W. Shen, Q. Song, X. Lou, Y. F. Fang, X. S. Liu, Y. H. Song, Y. J. Jiao, T. F. Duan, H. H. Wen, P. Dudin, G. Kotliar, Z. P. Yin, D. L. Feng
DOI 10.1103/PhysRevLett.121.117002 · Physical Review Letters
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The mechanism of high superconducting transition temperatures (Tc) in bismuthates remains under debate despite more than 30 years of extensive research. Our angle-resolved photoemission spectroscopy studies on Ba0.51K0.49BiO3 reveal an unexpectedly 34% larger bandwidth than in conventional density functional theory calculations. This can be reproduced by calculations that fully account for long-range Coulomb interactions—the first direct demonstration of bandwidth expansion due to the Fock exchange term, a long-accepted and yet uncorroborated fundamental effect in many body physics.Furthermore, we observe an isotropic superconducting gap with 2Δ0/kBTc=3.51±0.05, and strong electron-phonon interactions with a coupling constant λ∼1.3±0.2. These findings solve a long-standing mystery—Ba0.51K0.49BiO3 is an extraordinary Bardeen-Cooper-Schrieffer superconductor, where long-range Coulomb interactions expand the bandwidth, enhance electron-phonon coupling, and generate the high Tc. Such effects will also be critical for finding new superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba0.51K0.49BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | Pressure not reported | unknown |
| Ba1-xKxBiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
| BaBiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Scaling of magnetization and some basic parameters of Ba1−xKxBiO3+y superconductors near Tc
similarity 0.97S. N. Barilo et al.
Source status unknown — claims are unverified
Optical response of Ba1−xKxBiO3: Evidence for an unusual coupling mechanism of superconductivity
similarity 0.97H. J. Kaufmann et al.
Source status unknown — claims are unverified
Pairing and phase separation in BiO3-based superconductors
similarity 0.97A. A. Aligia & M. Baliña
Source status unknown — claims are unverified
Magnetic and resistive measurements of the superconducting critical fields of melt-cast Ba0.65K0.35BiO3
similarity 0.97W. K. Kwok et al.
Source status unknown — claims are unverified
Field-tuned superconductor-insulator transition in BaPb1−xBixO3
similarity 0.96P. Giraldo-Gallo et al.
Source status unknown — claims are unverified
Momentum-Resolved Electronic Structure of the High-Tc Superconductor Parent Compound BaBiO3
similarity 0.96N. C. Plumb et al.
Source status unknown — claims are unverified