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π-Electron-Assisted Relaxation of Spin Excited States in Cobalt Phthalocyanine Molecules on Au(111) Surface
Xiao-gang Liu,Hong-jian Du,Bin Li*,Ye-liang Zhao,Ai-di Zhao,Bing Wang*
Author NameAffiliationE-mail
Xiao-gang Liu Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China  
Hong-jian Du Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China  
Bin Li* Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China libin@mail.ustc.edu.cn 
Ye-liang Zhao Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China  
Ai-di Zhao Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China  
Bing Wang* Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China bwang@ustc.edu.cn 
Abstract:
We present our investigation on the spin relaxation of cobalt phthalocyanine (CoPc) films on Au(111) (CoPc/Au(111)) surface using scanning tunneling microscopy and spectroscopy. The spin relaxation time derived from the linewidth of spin-flip inelastic electron tunneling spectroscopy is quantitatively analyzed according to the Korringa-like formula. We find that although this regime of the spin relaxation time calculation by just considering the exchange interaction between itinerant conduction electrons and localized d-shells (s-d exchange interaction) can successfully reproduce the experimental value of the adsorbed magnetic atom, it fails in our case of CoPc/Au(111). Instead, we can obtain the relaxation time that is in good agreement with the experimental result by considering the fact that the π electrons in CoPc molecules are spin polarized, where the spin polarized π electrons extended at the Pc macrocycle may also scatter the conduction electrons in addition to the localized d spins. Our analyses indicate that the scattering by the π electrons provides an efficient spin relaxation channel in addition to the s-d interaction and thus leads to much short relaxation time in such a kind of molecular system on a metal substrate.
Key words:  Scanning tunneling microscopy  Spin relaxation  Single molecule  s-d coupling
FundProject:This work was supported by the National Natural Science Foundation of China (No.91321309, No.91421313, No.21421063, and No.21273210), the "Strategic Priority Research Program" of the Chinese Academy of Sciences (No.XDB01020100), and the Fundamental Research Funds for the Central Universities (No.2340000050 and No.2340000074)
Au(111)表面钴酞菁分子自旋激发态的π电子辅助自旋弛豫
刘小刚,杜宏健,李斌*,赵烨梁,赵爱迪,王兵*
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DOI:10.1063/1674-0068/30/cjcp1609178
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