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Instruments / Technical Area	Publication Details	Published
I05-ARPES	Strong band renormalization and emergent ferromagnetism induced by electron-antiferromagnetic-magnon coupling T. Yu , M. Xu , W. T. Yang , Y. H. Song , C. H. P. Wen , Q. Yao , X. Lou , T. Zhang , W. Li , X. Y. Wei , J. K. Bao , G. H. Cao , P. Dudin , J. D. Denlinger , V. N. Strocov , R. Peng , H. C. Xu , D. L. Feng Nature Communications 13 DOI: 10.1038/s41467-022-34254-0 Diamond Proposal Number(s): [20697] Open Access Show Abstract ▼ Abstract: The interactions between electrons and antiferromagnetic magnons (AFMMs) are important for a large class of correlated materials. For example, they are the most plausible pairing glues in high-temperature superconductors, such as cuprates and iron-based superconductors. However, unlike electron-phonon interactions (EPIs), clear-cut observations regarding how electron-AFMM interactions (EAIs) affect the band structure are still lacking. Consequently, critical information on the EAIs, such as its strength and doping dependence, remains elusive. Here we directly observe that EAIs induce a kink structure in the band dispersion of Ba1−xKxMn2As2, and subsequently unveil several key characteristics of EAIs. We found that the coupling constant of EAIs can be as large as 5.4, and it shows strong doping dependence and temperature dependence, all in stark contrast to the behaviors of EPIs. The colossal renormalization of electron bands by EAIs enhances the density of states at Fermi energy, which is likely driving the emergent ferromagnetic state in Ba1−xKxMn2As2 through a Stoner-like mechanism with mixed itinerant-local character. Our results expand the current knowledge of EAIs, which may facilitate the further understanding of many correlated materials where EAIs play a critical role.	Nov 2022
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
I16-Materials and Magnetism	Magnetic polarization of Ir in underdoped nonsuperconducting Eu(Fe0.94Ir0.06)2As2 W. T. Jin , Y. Xiao , Y. Su , S. Nandi , W. H. Jiao , Gareth Nisbet , S. Demirdis , G. H. Cao , Th. Brückel Physical Review B 93 (2) DOI: 10.1103/PhysRevB.93.024517 Show Abstract ▼ Abstract: Using polarized neutron diffraction and x-ray resonant magnetic scattering (XRMS) techniques, multiple phase transitions were revealed in an underdoped, nonsuperconducting Eu(Fe1−xIrx)2As2 (x=0.06) single crystal. Compared with the parent compound EuFe2As2, the tetragonal-to-orthorhombic structural phase transition and the antiferromagnetic order of the Fe2+ moments are significantly suppressed to TS=111(2) K and TN,Fe=85(2) K by 6% Ir doping, respectively. In addition, the Eu2+ spins order within the ab plane in the A-type antiferromagnetic structure similar to the parent compound. However, the order temperature is evidently suppressed to TN,Eu=16.0(5) K by Ir doping. Most strikingly, the XRMS measurements at the Ir L3 edge demonstrates that the Ir 5d states are also magnetically polarized, with the same propagation vector as the magnetic order of Fe. With TN,Ir=12.0(5) K, they feature a much lower onset temperature compared with TN,Fe. Our observation suggests that the magnetism of the Eu sublattice has a considerable effect on the magnetic nature of the 5d Ir dopant atoms and there exists a possible interplay between the localized Eu2+ moments and the conduction d electrons on the FeAs layers.	Jan 2016

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