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Wen, C H P; Xu, H C; Yao, Q; Peng, R; Niu, X H; Chen, Q Y; Liu, Z T; Shen, D W; Song, Q; Lou, X; Fang, Y F; Liu, X S; Song, Y H; Jiao, Y J; Duan, T F; Wen, H H; Dudin, P; Kotliar, G; Yin, Z P; Feng, D L
Physical review letters, 09/2018, Letnik: 121, Številka: 11Journal Article
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.
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in: SICRIS
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