Unveiling the Superconducting Mechanism of Ba0.51K0.49BiO3

物理 计算机科学
作者
Chenhaoping Wen,Haishui Xu,Qi Yao,Rui Peng,X. H. Niu,Qiuyun Chen,Z. T. Liu,Dawei Shen,Qianqian Song,Xin Lou,Yangfu Fang,Xiansheng Liu,Yu Song,Yanjing Jiao,T. F. Duan,Hong Wen,Pavel Dudin,Gabriel Kotliar,Zhiping Yin,D. L. Feng
出处
期刊:Physical Review Letters [American Physical Society]
卷期号:121 (11) 被引量:59
标识
DOI:10.1103/physrevlett.121.117002
摘要

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.Received 16 March 2018Revised 8 July 2018DOI:https://doi.org/10.1103/PhysRevLett.121.117002© 2018 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasElectron-phonon couplingElectronic structureSuperconducting gapSuperconducting order parameterSuperconductor-insulator transitionPhysical SystemsHigh-temperature superconductorsOxidesTechniquesAngle-resolved photoemission spectroscopyElectron-correlation calculationsCondensed Matter, Materials & Applied Physics

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