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Strong band renormalization and emergent ferromagnetism induced by electron-antiferromagnetic-magnon coupling

DOI: 10.1038/s41467-022-34254-0 DOI Help

Authors: T. Yu (Fudan University) , M. Xu (Fudan University) , W. T. Yang (Fudan University) , Y. H. Song (Fudan University) , C. H. P. Wen (Fudan University) , Q. Yao (Fudan University) , X. Lou (Fudan University) , T. Zhang (Fudan University; Shanghai Research Center for Quantum Sciences; Collaborative Innovation Center of Advanced Microstructures (China)) , W. Li (Fudan University) , X. Y. Wei (Fudan University) , J. K. Bao (Zhejiang University) , G. H. Cao (Zhejiang University) , P. Dudin (Diamond Light Source) , J. D. Denlinger (Advanced Light Source) , V. N. Strocov (Swiss Light Source) , R. Peng (Fudan University; Shanghai Research Center for Quantum Sciences) , H. C. Xu (Fudan University) , D. L. Feng (Fudan University; Shanghai Research Center for Quantum Sciences; Collaborative Innovation Center of Advanced Microstructures (China); University of Science and Technology of China)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nature Communications , VOL 13

State: Published (Approved)
Published: November 2022
Diamond Proposal Number(s): 20697

Open Access Open Access

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.

Diamond Keywords: Ferromagnetism

Subject Areas: Materials, Physics

Instruments: I05-ARPES

Other Facilities: 4.0.3 at ALS; ADRESS at Stanford Synchrotron Radiation Light Source; 5-2 at SLS; BL03U at Shanghai Synchrotron Radiation Facility; National Synchrotron Radiation Laboratory

Added On: 04/11/2022 08:57


Discipline Tags:

Superconductors Quantum Materials Physics Hard condensed matter - structures Materials Science

Technical Tags:

Spectroscopy Angle Resolved Photoemission Spectroscopy (ARPES)