NMR study of Bi2-xMnxSe3

• Main Authors: Liu, Yuan-Long, 劉源龍
• Other Authors: Young, Ben-Li
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/62078489665036266493

碩士 === 國立交通大學 === 電子物理系所 === 101 === This thesis is used nuclear magnetic resonance to study the topological insulator of Bi2-xMnxSe3. Bi2-xMnxSe3 grown by Bridgeman Method with x=0,x=0.05 and Chemical Vapor Transport with x=0.01,0.03,0.05,0.15,respectively. We measured the 209Bi NMR signals of Bi2-xMnxSe3. According to the emerging peak position of 209Bi specturm, we infer that the sign of the frequency shift caused by the Mn ions is negative. The negative frequency shift in a semiconductor strongly depends on the band structures that determine the orbital involved in the spin transfer and the sign of the g-factor in the contact interaction. We found the emerging peak of Bi2-xMnxSe3 at around 20 K implies a magnetic short-range correlation.