Roles of surface and bulk states in giant magnetoresistance and anomalous hall effect in antiferromagnetically ordered Bi1.9Dy0.1Te3 topological insulators

被引:4
作者
Gangwar, Vinod K. [1 ,8 ]
Kumar, Shiv [2 ]
Singh, Mahima [1 ]
Pal, Debarati [1 ]
Ghosh, Labanya [1 ]
Singh, Prajyoti [1 ]
Yufeng, Zhang [3 ]
Chen, Chaoyu [4 ,5 ]
Schwier, Eike F. [2 ,9 ,10 ]
Shimada, Kenya [2 ]
Shahi, Prashant [6 ]
Uwatoko, Yoshiya [3 ]
Patil, Swapnil [1 ]
Ghosh, Anup K. [7 ]
Chatterjee, Sandip [1 ]
机构
[1] Indian Inst Technol BHU, Dept Phys, Varanasi 221005, India
[2] Hiroshima Univ, Hiroshima Synchrotron Radiat Ctr, Hiroshima 7390046, Japan
[3] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan
[4] Southern Univ Sci & Technol SUSTech, Shenzhen Inst Quantum Sci & Engn SIQSE, Shenzhen 518055, Guangdong, Peoples R China
[5] Southern Univ Sci & Technol SUSTech, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China
[6] DDU Gorakhpur Univ, Dept Phys, Gorakhpur 273009, India
[7] Banaras Hindu Univ, Dept Phys, Varanasi 221005, India
[8] KGK PG Coll MoradabadIndia, Dept Phys, Moradabad 244001, India
[9] Univ Wurzburg, Expt Phys 7, D-97074 Wurzburg, Germany
[10] Wurzburg Dresden Cluster Excellence ct qmat, Wurzburg, Germany
关键词
MASSIVE DIRAC FERMION; MAGNETIC-PROPERTIES; DOPED BI2TE3; REALIZATION; HEUSLER;
D O I
10.1039/d2tc03255d
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A wide variety of emerging spintronic device concepts will greatly benefit from the use of materials with an anomalous Hall effect and large magnetoresistance. In this regard, a magnetic topological insulator is a potential candidate, leading to a better way to manipulate spin. The different roles of surface and bulk states in Bi1.9Dy0.1Te3 topological insulators are determined by investigating electronic states, magnetotransport properties, Seebeck coefficient and magnetization. Magnetoresistance attains a huge value similar to 1500% at a magnetic field of 7 T, which is attributed to the surface state. The magnetization behavior clearly suggests the existence of an antiferromagnetic state. The observed anomalous Hall effect is established as the contribution from the bulk state. Furthermore, it is demonstrated that there is no appreciable energy gap at the Dirac point of the topological surface.
引用
收藏
页码:17281 / 17290
页数:10
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