Transport properties of topologically non-trivial bismuth tellurobromides BinTeBr
| Autor: | Noha Alzahrani, Falk Pabst, Michael Ruck, E. V. Chulkov, Joshua Martin, Igor P. Rusinov, Dean Hobbis, George S. Nolas, Hsin Wang |
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| Přispěvatelé: | European Commission, German Research Foundation, National Science Foundation (US), Ministry of Education and Science of the Russian Federation, Tomsk State University, Saint Petersburg State University |
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Doping General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Electronic structure 021001 nanoscience & nanotechnology Thermoelectric materials 01 natural sciences Article Semimetal Bismuth Thermal conductivity chemistry Electrical resistivity and conductivity 0103 physical sciences Thermoelectric effect 0210 nano-technology |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.5116369 |
| Popis: | Temperature-dependent transport properties of the recently discovered layered bismuth-rich tellurobromides BinTeBr (n = 2, 3) are investigated for the first time. Dense homogeneous polycrystalline specimens prepared for different electrical and thermal measurements were synthesized by a ball milling-based process. While the calculated electronic structure classifies Bi2TeBr as a semimetal with a small electron pocket, its transport properties demonstrate a semiconductorlike behavior. Additional bismuth bilayers in the Bi3TeBr crystal structure strengthens the interlayer chemical bonding thus leading to metallic conduction. The thermal conductivity of the semiconducting compositions is low, and the electrical properties are sensitive to doping with a factor of four reduction in resistivity observed at room temperature for only 3% Pb doping. Investigation of the thermoelectric properties suggests that optimization for thermoelectrics may depend on particular elemental substitution. The results presented are intended to expand on the research into tellurohalides in order to further advance the fundamental investigation of these materials, as well as investigate their potential for thermoelectric applications. This work was supported by the ERASMUS+ ICM WORLDWIDE exchange program funded by the European Union. F.P. and M.R. acknowledge financial support from the Deutsche Forschungsgemeinschaft (DFG) through the Würzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter—ct.qmat (EXC 2147, Project No. 39085490). G.S.N. acknowledges the support from the U.S. National Science Foundation (NSF) under Grant No. DMR-1748188. D.H. acknowledges the II-VI Foundation Block-Gift Program. H.W. acknowledges the support of the assistant secretary of Energy Efficiency and Renewable Energy and the Materials Program under the Vehicle Technologies Program. Oak Ridge National Laboratory is managed by UT-Batelle LLC under Contract No. DE-AC05000OR22725. I.P.R. acknowledges the support from the Ministry of Education and Science of the Russian Federation within the framework of the governmental program “Megagrants” (State Task No. 3.8895.2017/P220) (for theoretical investigation of thermoelectric properties of Bi3TeBr), Academic D. I. Mendeleev Fund Program of Tomsk State University (Project No. 8.1.01.2018), and by the Russian Science Foundation No. 18-12-00169 (for theoretical investigation of thermoelectric properties of Bi2TeBr); E.V.C. and I.P.R. also acknowledge the support from Saint Petersburg State University (Project No. 15.61.202.2015). |
| Databáze: | OpenAIRE |
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