Influence of an Anomalous Temperature Dependence of the Phase Coherence Length on the Conductivity of Magnetic Topological Insulators

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  • V. Tkáč, Charles University in Prague, P. J. Šafárik University
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  • K. Výborný, Institute of Physics of the Academy of Sciences of the Czech Republic
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  • V. Komanický, P. J. Šafárik University
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  • J. Warmuth, Universitat Hamburg
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  • M. Michiardi
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  • A. S. Ngankeu
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  • M. Vondráček, Institute of Physics of the Academy of Sciences of the Czech Republic
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  • R. Tarasenko, Charles University in Prague, P. J. Šafárik University
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  • M. Vališka, Charles University in Prague
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  • V. Stetsovych, Institute of Physics of the Academy of Sciences of the Czech Republic
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  • K. Carva, Charles University in Prague
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  • I. Garate, University of Sherbrooke
  • ,
  • M. Bianchi
  • J. Wiebe, Universitat Hamburg
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  • V. Holý, Charles University in Prague
  • ,
  • Ph Hofmann
  • G. Springholz, Kepler University Hospital
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  • V. Sechovský, Charles University in Prague
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  • J. Honolka, Institute of Physics of the Academy of Sciences of the Czech Republic

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)PRLTAO0031-900710.1103/PhysRevLett.112.146601] on magnetically doped topological insulators predicts that quantum corrections Δκ 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 Δκ 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.

Original languageEnglish
Article number036406
JournalPhysical Review Letters
Volume123
Issue3
ISSN0031-9007
DOIs
Publication statusPublished - Jul 2019

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