Structural and magnetotransport characterization of magnetron sputtered co-doped Bi2Te3 thin films
Source abstract
Abstract
Abstract In this work we investigate the growth and magnetotransport properties of Co doped topological insulator Bi2Te3 deposited on Si(1 1 1) substrates by means of DC magnetron sputtering. The structure and morphology of the films were studied using X-Ray Diffraction (XRD), Field-Emission Scanning Electron Microscopy (FESEM) and Atomic Force Microscopy (AFM). Magnetotransport measurements were performed with a Physical Property Measurement System (PPMS). The pristine samples have a metallic behavior while the Co-doped are semiconductors. The magnetoresistance curves exhibit a sharp cusp for temperatures below 20 K that correspond to weak antilocalization phenomena and are analysed using the Hikami-Larkin-Nagaoka model. The WAL phenomenon vanishes with temperature increase due to electron-phonon scattering. The doped samples present an ambipolar transport with a change in the sign of the dominant carriers with temperature.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Topological Materials and Phenomena · Graphene research and applications · Quantum many-body systems
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (24)
Show source-provided references
1. Electrical and thermal properties of Bi2Te310.1103/PhysRev.108.1164 ↗
2. Z2 topological order and the quantum spin Hall effect10.1103/PhysRevLett.95.146802 ↗
3. Quantum spin Hall effect and topological phase transition in HgTe quantum wells10.1126/science.1133734 ↗
4. Quantum spin Hall insulator state in HgTe quantum wells10.1126/science.1148047 ↗
5. Surface-quantized anomalous Hall current and the magnetoelectric effect in magnetically disordered topological insulators10.1103/PhysRevLett.106.166802 ↗
6. Unconventional superconductivity on a topological insulator10.1103/PhysRevLett.104.067001 ↗
7. Experimental observation of the Quantum Anomalous Hall Effect in a magnetic topological insulator10.1126/science.1234414 ↗
8. Experimental realization of a three-dimensional topological insulator, Bi2Te310.1126/science.1173034 ↗
9. A topological Dirac insulator in a quantum spin Hall phase10.1038/nature06843 ↗
10. Observation of a large-gap topological-insulator class with a single Dirac cone on the surface10.1038/nphys1274 ↗
11. Ferromagnetism in new diluted magnetic semiconductor Bi2−xFexTe310.1016/S0921-4526(01)00975-9 ↗
12. Anomalous Hall Effect in a Magnetic Topological Insulator (BiMn)2Te310.1109/TMAG.2019.2899735 ↗
13. Quantum Anomalous Hall Effect with higher plateaus10.1103/PhysRevLett.111.136801 ↗
14. Granularity controlled nonsaturating linear magnetoresistance in topological insulator Bi2Te3 films10.1021/nl503083q ↗
15. Achieving surface quantum oscillations in topological insulator thin films of Bi2Se310.1002/adma.201201827 ↗
16. Structural properties of Bi2Te3 topological insulator thin films grown by molecular beam epitaxy on (111) BaF2 substrates10.1063/1.4947266 ↗
17. Warren · 1990
18. Weak anti-localization-an experimental proof for the destructive interference of rotated spin ½10.1016/0038-1098(82)90013-8 ↗
19. Yi Cui, Weak antilocalization in Bi2(SexTe1−x)3 nanoribbons and nanoplates10.1021/nl300018j ↗
20. Graphene: status and prospects10.1126/science.1158877 ↗
21. Spin-orbit interaction and magnetoresistance in the two dimensional random system10.1143/PTP.63.707 ↗
22. Linear magnetoresistance and surface to bulk coupling in topological insulator thin films
23. Extremely large nonsaturating magnetoresistance and ultrahigh mobility due to topological surface states in the metallic Bi2Te3 topological insulator
24. Electrical transport properties of n-type (110)-oriented bismuth films grown at 110 K on glass substrates10.1063/1.2957055 ↗