主要研究了Bi1．85 In0．15 Se3的晶体结构、微观形貌及电输运性能.样品具有六方层状结构,形成的晶体易解理.样品的电阻率曲线在低温区域出现了金属-绝缘体转变行为.拟合结果表明,在低温下电子-电子散射和Mott变程跃迁模式共存,Mott变程跃迁模式在低温下对电阻率贡献作用的增大,导致金属-绝缘体转变的出现；而在高温区域,声子散射及电离杂质散射对载流子的作用共存.当施加外加磁场时,样品出现了与纯Bi2 Se3相反的负磁电阻效应.这种反常的磁电阻行为可能跟由洛仑兹力导致的正磁电阻与自旋无序电阻率减小引起的负磁电阻之间的竞争作用有关.
The phase structure,electrical and magnetic transport properties of Bi1.85 In0.15 Se3 were studied.The sample with rhombohedral layered crystal structure can be cleaved easily.A metal-insulator (M-I)transition be-haviour of resistivity was observed at low temperature region,which come from the contribution of the variable range transport mechanism.For high temperature region,the phonon scattering and the ionized impurities scat-tering effect were both existed.Magnetic-field-induced metal-insulator transitions were observed in the Bi1.85 In0.15 Se3 sample with negative magnetoresistance (NMR).The change in MR was related to the competition be-tween lorentz force and the decreasing of spin disordered resistivity.
参考文献
| [1] | O. A. Tretiakov;Ar. Abanov;Jairo Sinova.Holey topological thermoelectrics[J].Applied physics letters,201111(11):113110-1-113110-3. |
| [2] | Zhang, HJ;Liu, CX;Qi, XL;Dai, X;Fang, Z;Zhang, SC.Topological insulators in Bi2Se3, Bi2Te3 and Sb2Te3 with a single Dirac cone on the surface[J].Nature physics,20096(6):438-442. |
| [3] | Fu L;Kane CL;Mele EJ.Topological insulators in three dimensions[J].Physical review letters,200710(10):6803-1-6803-4-0. |
| [4] | Yi Zhang;Cui-Zu Chang;Ke He;Li-Li Wang;Xi Chen;Jin-Feng Jia;Xu-Cun Ma;Qi-Kun Xue.Doping effects of Sb and Pb in epitaxial topological insulator Bi_(2)Se_(3) thin films: An in situ angle-resolved photoemission spectroscopy study[J].Applied physics letters,201019(19):194102-1-194102-3. |
| [5] | Mei-Xiao Wang;Canhua Liu;Jin-Peng Xu;Fang Yang;Lin Miao;Meng-Yu Yao;C. L. Gao;Chenyi Shen;Xucun Ma;X. Chen;Zhu-An Xu;Ying Liu;Shou-Cheng Zhang;Dong Qian;Jin-Feng Jia;Qi-Kun Xue.The Coexistence of Superconductivity and Topological Order in the Bi_2Se_3 Thin Films[J].Science,2012Apr.6 TN.6077(Apr.6 TN.6077):52-55. |
| [6] | Inducing A Magnetic Monopole With Topological Surface States[J].Science,2009Feb.27 TN.5918(Feb.27 TN.5918):1184. |
| [7] | Luo, W.;Qi, X.-L..Massive Dirac surface states in topological insulator/magnetic insulator heterostructures[J].Physical review, B. Condensed matter and materials physics,20138(8):085431-1-085431-7. |
| [8] | 牛成旺 .拓扑绝缘体材料铁磁性及表面态的调控[D].山东大学,2013. |
| [9] | Superconductivity in Cu_xBi_2Se_3 and its Implications for Pairing in the Undoped Topological Insulator[J].Physical review letters,20105(5):057001.1. |
| [10] | Wei, Zhantao;Lv, Li;Zhang, Min;Yang, Xinsheng;Zhao, Yong.Tuning of Electrical and Magnetic Transport Properties in Bi2Se3 Topological Insulator Crystals Doped with Mn[J].Journal of Superconductivity and Novel Magnetism,20157(7):2083-2088. |
| [11] | Min Zhang;Li Lv;Zhantao Wei;Liqin Yang;Xinsheng Yang;Yong Zhao.Electrical and magnetic transport properties of Co-doped Bi_2Se_3 topological insulator crystals[J].International Journal of Modern Physics, B. Condensed Matter Physics, Statistical Physics, Applied Physics,201417(17):1450108-1-1450108-9. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%