Direct visualization of surface phase of oxygen molecules physisorbed on Ag(111) surface: A two-dimensional quantum spin system

被引：3

作者：

Yamamoto, Shunji ^{[1
]}

Yoshida, Yasuo ^{[1
]}

Imada, Hiroshi ^{[2
]}

Kim, Yousoo ^{[2
]}

Hasegawa, Yukio ^{[1
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, 5-1-5 Kashiwa No Ha, Kashiwa, Chiba 2778581, Japan

[2] SISL RIKEN, 2-1 Hirosawa, Wako, Saitama 3510198, Japan

来源：

PHYSICAL REVIEW B | 2016年 / 93卷 / 08期

关键词：

SOLID OXYGEN; STATE ELECTRONS; MONOLAYERS; GRAPHITE; DIFFRACTION; MAGNETISM;

D O I：

10.1103/PhysRevB.93.081408

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on the real-space observation of the two-dimensional distorted triangular lattice of physisorbed oxygen (O-2) molecules on an Ag(111) surface by low-temperature scanning tunneling microscopy. The physisorbed state of the O-2 monolayers was confirmed by measuring their thermal stability, which showed good agreement with previous thermal desorption spectroscopy. The distortion of the observed lattice was reproduced quantitatively by considering the intermolecular exchange interaction in Monte Carlo calculations, indicating a critical role of antiferromagnetic ordering of O-2 spins. In tunneling spectra, the Kondo resonance was not observed on the O-2 layer at 4.7 K unlike the case of physisorbed O-2 on Ag(110). These results indicate that an intrinsic S = 1 spin of the O-2 molecules was preserved to form a two-dimensional antiferromagnetic quantum spin system on the surface.

引用

页数：5

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