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Instruments / Technical Area	Publication Details	Published	Actions
I05-ARPES	Coexistence of polaronic states and superconductivity in iron-pnictide compound Ba2Ti2Fe2As4O Li-Yuan Rong , Xun Shi , Pierre Richard , Yun-Lei Sun , Guang-Han Cao , Xiang-Zhi Zhang , Jun-Zhang Ma , Ming Shi , Yao-Bo Huang , Tian Qian , Hong Ding , Ren-Zhong Tai Chinese Physics Letters 35 DOI: 10.1088/0256-307X/35/5/057401 Diamond Proposal Number(s): [11452] Show Abstract ▼ Abstract: The electronic structure of iron-pnictide compound superconductor Ba2Ti2Fe2As4O, which has metallic intermediate Ti2O layers, is studied using angle-resolved photoemission spectroscopy. The Ti-related bands show a 'peak-dip-hump' line shape with two branches of dispersion associated with the polaronic states at temperatures below around 120 K. This change in the spectra occurs along with the resistivity anomaly that was not clearly understood in a previous study. Moreover, an energy gap induced by the superconducting proximity effect opens in the polaronic bands at temperatures below Tc(∼21 K). Our study provides the spectroscopic evidence that superconductivity coexists with polarons in the same bands near the Fermi level, which provides a suitable platform to study interactions between charge, lattice and spin freedoms in a correlated system.	Apr 2018
I05-ARPES	Observation of a Van Hove singularity and implication for strong-coupling induced Cooper pairing in Delong Fang , Xun Shi , Zengyi Du , Pierre Richard , Huan Yang , X. X. Wu , Peng Zhang , Tian Qian , Xiaxin Ding , Zhenyu Wang , T. K. Kim , Moritz Hoesch , Aifeng Wang , Xianhui Chen , Jiangping Hu , Hong Ding , Hai-Hu Wen Physical Review B 92 (14) DOI: 10.1103/PhysRevB.92.144513 Show Abstract ▼ Abstract: Scanning tunneling spectroscopy and angle-resolved photoemission spectroscopy have been investigated on single-crystal samples of KFe2As2. A Van Hove singularity (VHS) has been directly observed just a few meV below the Fermi level (EF) of superconducting KFe2As2, which locates in the middle of the principal axes of the first Brillouin zone. The majority of the density of states at EF, mainly contributed by the proximity effect of the saddle point to EF, is nongapped in the superconducting state. Our observation of the ungapped feature of the density of states due to the VHS points, while providing consistent explanations to many exotic behaviors previously observed in this material, suggests Cooper pairing induced by a strong-coupling mechanism.	Oct 2015

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