Kondo-Fano resonance in atomic-scale contacts for ferromagnetic metals

International Conference on Strongly Correlated Electron Systems 2016

Islam, M.S.^1 ; Takata, H.^1 ; Ueno, Y.^1 ; Ienaga, K.^2 ; Inagaki, Y.^1 ; Tsujii, H.^3 ; Kawae, T.^1

Department of Applied Quantum Physics, Kyushu University, Fukuoka, Japan^1

Department of Physics, Tokyo Institute of Technology, Tokyo, Japan^2

Division of Science Education, Kanazawa University, Kanazawa, Japan^3

关键词: Atomic-scale contacts;    Characteristic temperature;    Electrical conductance;    Fano resonances;    Ferromagnetic properties;    Log-normal distribution;    MCBJ;    Mechanically controllable break junctions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/807/8/082002/pdf
DOI  :  10.1088/1742-6596/807/8/082002

来源: IOP

【 摘 要 】

The electrical conductance of cobalt (Co) nano-scale contacts prepared by a Mechanically Controllable Break Junction (MCBJ) technique has been studied to understand the origin of Fano resonance in ferromagnetic atomic-sized contacts. In an atomic-scale contacts, the zero-bias anomaly is well-fitted by the Fano formula. The characteristic temperature, which is introduced as the fitting parameter of that formula, exhibits the log-normal distribution. These indicate that the anomaly is likely caused by Kondo effect. Moreover, the zero-bias anomaly is observed in large scale contacts where the bulk ferromagnetic properties should be retained. This suggests the coexistence of Kondo effect and ferromagnetism.