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Dresden 2020 – scientific programme

The DPG Spring Meeting in Dresden had to be cancelled! Read more ...

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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−xKxMn2As2Tianlun Yu1, Rui Peng1, Guanghan Cao2, •Haichao Xu1, and Donglai Feng11Laboratory 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.

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