期刊论文详细信息
Electron-phonon coupling induced pseudogap and the superconducting transition in Ba0.67K0.33BiO3 | |
Article | |
关键词: HIGH-TEMPERATURE SUPERCONDUCTIVITY; METAL-INSULATOR-TRANSITION; STRUCTURAL PHASE-DIAGRAM; DENSITY-OF-STATES; X-RAY-ABSORPTION; HIGH-TC; SPIN-GAP; BA1-XKXBIO3; PHOTOEMISSION; BA0.6K0.4BIO3; | |
DOI : 10.1103/PhysRevB.64.180509 | |
来源: SCIE |
【 摘 要 】
We study the single-particle density of states (DOS) across the superconducting transition (T-c = 31 K) in single-crystal Ba0.67K0.33BiO3 using ultrahigh resolution angle-integrated photoemission spectroscopy. The superconducting gap opens with a pileup in the DOS, Delta (5.3 K) = 5.2 meV and 2 Delta (0)/k(B)T(c) = 3.9. In addition, we observe a pseudogap below and above T-c occurring as a suppression in intensity over an energy scale up to the breathing mode phonon (similar to 70 meV). The results indicate electron-phonon coupling induces a pseudogap in Ba0.67K0.33BiO3.
【 授权许可】
Free