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O: Fachverband Oberflächenphysik

O 71: Electronic Structure of Surfaces I

O 71.1: Hauptvortrag

Mittwoch, 18. März 2020, 15:00–15:30, REC C 213

Detection of strong interaction between electrons and antiferromagnetic magnons in Ba_1−xK_xMn₂As₂ — Tianlun Yu¹, Rui Peng¹, Guanghan Cao², •Haichao Xu¹, and Donglai Feng¹ — ¹Laboratory of Advanced Materials, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200438, People’s Republic of China — ²Department of Physics, Zhejiang University, Hangzhou 310027, People’s Republic of China

The behavior of itinerant carriers under an antiferromagnetic background is critical for many novel physics. K-doped BaMn₂As₂ hosts an robust antiferromagnetic order and strong Mn local moments in its highly hole doped metallic state. Here we revealed the band structure by angle-resolved photoemission spectroscopy, and a kink in dispersion is observed at Fermi energy. The coupling constant from self-energy analysis reveales an extremely strong coupling between the itinerant holes and antiferromagnetic magnons. The evolution of the Fermi surface volume with the hole doping follows the Luttinger theory of a normal metal, which rules out a simple half-metal picture of the itinernt ferromagnetism. The large mass enhancement of the As 4p holes by the electron-magnon coupling may be responsible for the emergent itinereant ferromagnetism.