Structural phase transitions of Pb-adsorbed Si(111) surfaces at low temperatures

作     者：Kotaro Horikoshi Xiao Tong Tadaaki Nagao Shuji Hasegawa 

作者机构：Core Research for Evolutional Science and Technology The Japan Science and Technology Corporation Kawaguchi Center Building Hon-cho 4-1-8 Kawaguchi Saitama 332 Japan 

出 版 物：《Physical Review B》 (Phys. Rev. B Condens. Matter Mater. Phys.)

年 卷 期：1999年第60卷第19期

页      面：13287-13287页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

摘      要：We found two types of commensurate-incommensurate transition on Pb-adsorbed Si(111) surfaces using reflection high-energy electron diffraction (RHEED) below room temperature (RT); a hexagonal incommensurate (HIC) phase changed to a 7×3−Pb superstructure around 250 K, and a transient phase between the HIC phase and a striped incommensurate phase changed to a 43×3−Pb superstructure at 130 K. We constructed a surface structure map in ranges of temperature from 90 K to 500 K and Pb coverage from 0.8 to 1.5 atomic layers including these new phases. We found another structure change where streaks with a 3×3 periodicity began to appear in RHEED just below RT when the 3×3−Pb phase at 1/3 atomic layer of Pb was cooled.