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Nickel: The time-reversal symmetry conserving partner of iron on a chalcogenide topological insulator

M. Vondráček, L. Cornils, J. Minár, J. Warmuth, M. Michiardi, C. Piamonteze, L. Barreto, J. A. Miwa, M. Bianchi, Ph. Hofmann, L. Zhou, A. Kamlapure, A. A. Khajetoorians, R. Wiesendanger, J.-L. Mi, B.-B. Iversen, S. Mankovsky, St. Borek, H. Ebert, M. Schüler, T. Wehling, J. Wiebe, and J. Honolka
Phys. Rev. B 94, 161114(R) – Published 11 October 2016
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Abstract

We report on the quenching of single Ni adatom moments on Te-terminated Bi2Te2Se and Bi2Te3 topological insulator surfaces. The effect is noted as a missing x-ray magnetic circular dichroism for resonant L3,2 transitions into partially filled Ni 3d states of theory-derived occupancy nd=9.2. On the basis of a comparative study of Ni and Fe using scanning tunneling microscopy and ab initio calculations, we are able to relate the element specific moment formation to a local Stoner criterion. Our theory shows that while Fe adatoms form large spin moments of ms=2.54μB with out-of-plane anisotropy due to a sufficiently large density of states at the Fermi energy, Ni remains well below an effective Stoner threshold for local moment formation. With the Fermi level remaining in the bulk band gap after adatom deposition, nonmagnetic Ni and preferentially out-of-plane oriented magnetic Fe with similar structural properties on Bi2Te2Se surfaces constitute a perfect platform to study the off-on effects of time-reversal symmetry breaking on topological surface states.

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  • Received 7 April 2016
  • Revised 13 July 2016

DOI:https://doi.org/10.1103/PhysRevB.94.161114

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

M. Vondráček1,*, L. Cornils2, J. Minár3,4, J. Warmuth2, M. Michiardi5, C. Piamonteze6, L. Barreto5,†, J. A. Miwa5, M. Bianchi5, Ph. Hofmann5, L. Zhou2,‡, A. Kamlapure2, A. A. Khajetoorians2,§, R. Wiesendanger2, J.-L. Mi7,¶, B.-B. Iversen7, S. Mankovsky3, St. Borek3, H. Ebert3, M. Schüler8, T. Wehling8, J. Wiebe2, and J. Honolka1

  • 1Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, CZ-182 21 Prague, Czech Republic
  • 2Department of Physics, University of Hamburg, Jungiusstrasse 11, D-20355 Hamburg, Germany
  • 3Department of Chemistry, University of Munich, Butenandtstrasse 5-13, D-81377 München, Germany
  • 4New Technologies Research Center, University of West Bohemia, Univerzitní 8, CZ-306 14 Plzeň, Czech Republic
  • 5Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, DK-8000 Aarhus C, Denmark
  • 6Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
  • 7Center for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, Langelandsgade 140, DK-8000 Aarhus C, Denmark
  • 8Institute for Theoretical Physics, Bremen Center for Computational Material Science, University of Bremen, D-28359 Bremen, Germany

  • *vondrac@fzu.cz
  • Present address: Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André 09210-580, SP, Brazil.
  • Present address: Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany.
  • §Present address: Institute for Molecules and Materials (IMM), Radboud University, 6525 AJ Nijmegen, The Netherlands.
  • Present address: Institute for Advanced Materials, School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China.

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Issue

Vol. 94, Iss. 16 — 15 October 2016

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