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

被引：7

作者：

Yu, T. L. ^{[1
,2
]}

Xu, M. ^{[1
,2
]}

Yang, W. T. ^{[1
,2
]}

Song, Y. H. ^{[1
,2
]}

Wen, C. H. P. ^{[1
,2
]}

Yao, Q. ^{[1
,2
]}

Lou, X. ^{[1
,2
]}

Zhang, T. ^{[1
,2
,3
,4
]}

Li, W. ^{[1
,2
]}

Wei, X. Y. ^{[1
,2
]}

Bao, J. K. ^{[5
]}

Cao, G. H. ^{[5
]}

Dudin, P. ^{[6
]}

Denlinger, J. D. ^{[7
]}

Strocov, V. N. ^{[8
]}

Peng, R. ^{[1
,2
,3
]}

Xu, H. C. ^{[1
,2
]}

Feng, D. L. ^{[1
,2
,3
,4
,9
,10
]}

机构：

[1] Fudan Univ, Lab Adv Mat, State Key Lab Surface Phys, Shanghai 200438, Peoples R China

[2] Fudan Univ, Dept Phys, Shanghai 200438, Peoples R China

[3] Shanghai Res Ctr Quantum Sci, Shanghai 201315, Peoples R China

[4] Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Peoples R China

[5] Zhejiang Univ, Dept Phys, Hangzhou 310027, Peoples R China

[6] Diamond Light Source, Harwell Sci & Innovat Campus, Didcot OX11 0DE, Oxon, England

[7] Lawrence Berkeley Natl Lab, Adv Light Source, 1 Cyclotron Rd, Berkeley, CA 94720 USA

[8] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[9] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, CAS Ctr Excellence Quantum Informat & Quantum Phy, Hefei 230026, Peoples R China

[10] Univ Sci & Technol China, Dept Phys, Hefei 230026, Peoples R China

来源：

NATURE COMMUNICATIONS | 2022年 / 13卷 / 01期

基金：

中国国家自然科学基金;

关键词：

TOTAL-ENERGY CALCULATIONS; SPIN-WAVES; QUASI-PARTICLE; DISPERSION; PHYSICS;

D O I：

10.1038/s41467-022-34254-0

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The interaction between antiferromagnetic magnons and electrons sits at the heart of many strongly correlated systems, however, investigation has been hampered by a lack of clear-cut examples. Here, Yu et al directly observe a kink in the dispersion, a result of renormalization due to the electron-antiferromagnetic magnon interaction. 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.

引用

页数：8