Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 71: Electronic Structure of Surfaces I
O 71.1: Invited Talk
Wednesday, March 18, 2020, 15:00–15:30, REC C 213
Detection of strong interaction between electrons and antiferromagnetic magnons in Ba1−xKxMn2As2 — 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.