Influence of an Anomalous Temperature Dependence of the Phase Coherence Length on the Conductivity of Magnetic Topological Insulators
| Autor: | Ion Garate, Karel Carva, Matteo Michiardi, Vladimír Sechovský, Karel Výborný, Jan Honolka, Jens Wiebe, Martin Vondráček, V. Komanický, Jonas Warmuth, M. Vališka, V. Stetsovych, Václav Holý, Arlette S. Ngankeu, Marco Bianchi, Róbert Tarasenko, V. Tkáč, G. Springholz, Ph. Hofmann |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Condensed Matter - Materials Science Magnetic energy Spintronics Condensed matter physics Magnetism Fermi level Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences General Physics and Astronomy Inelastic scattering 01 natural sciences symbols.namesake Geometric phase Topological insulator 0103 physical sciences symbols Condensed Matter::Strongly Correlated Electrons 010306 general physics Surface states |
| Zdroj: | Physical Review Letters Tkáč, V, Výborný, K, Komanický, V, Warmuth, J, Michiardi, M, Ngankeu, A S, Vondráček, M, Tarasenko, R, Vališka, M, Stetsovych, V, Carva, K, Garate, I, Bianchi, M, Wiebe, J, Holý, V, Hofmann, P, Springholz, G, Sechovský, V & Honolka, J 2019, ' Influence of an Anomalous Temperature Dependence of the Phase Coherence Length on the Conductivity of Magnetic Topological Insulators ', Physical Review Letters, vol. 123, no. 3, 036406 . https://doi.org/10.1103/PhysRevLett.123.036406 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.123.036406 |
| Popis: | Magnetotransport constitutes a useful probe to understand the interplay between electronic band topology and magnetism in spintronic devices. A recent theory of Lu and Shen [Phys. Rev. Lett. 112, 146601 (2014)] on magnetically doped topological insulators predicts that quantum corrections $\mathrm{\ensuremath{\Delta}}\ensuremath{\kappa}$ to the temperature dependence of conductivity can change sign across the Curie transition. This phenomenon has been attributed to a suppression of the Berry phase of the topological surface states at the Fermi level, caused by a magnetic energy gap. Here, we demonstrate experimentally that $\mathrm{\ensuremath{\Delta}}\ensuremath{\kappa}$ can reverse its sign even when the Berry phase at the Fermi level remains unchanged. The contradictory behavior to theory predictions is resolved by extending the model by Lu and Shen to a nonmonotonic temperature scaling of the inelastic scattering length showing a turning point at the Curie transition. |
| Databáze: | OpenAIRE |
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