Spectroscopic perspective on the interplay between electronic and magnetic properties of magnetically doped topological insulators

J. A. Krieger, Cui Zu Chang, M. A. Husanu, D. Sostina, A. Ernst, M. M. Otrokov, T. Prokscha, T. Schmitt, A. Suter, M. G. Vergniory, E. V. Chulkov, J. S. Moodera, V. N. Strocov, Zaher Salman

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

We combine low energy muon spin rotation (LE-μSR) and soft-x-ray angle-resolved photoemission spectroscopy (SX-ARPES) to study the magnetic and electronic properties of magnetically doped topological insulators, (Bi,Sb)2Te3. We find that one achieves a full magnetic volume fraction in samples of (V/Cr)x(Bi,Sb)2-xTe3 at doping levels x=0.16. The observed magnetic transition is not sharp in temperature indicating a gradual magnetic ordering. We find that the evolution of magnetic ordering is consistent with formation of ferromagnetic islands which increase in number and/or volume with decreasing temperature. Resonant ARPES at the V L3 edge reveals a nondispersing impurity band close to the Fermi level as well as V weight integrated into the host band structure. Calculations within the coherent potential approximation of the V contribution to the spectral function confirm that this impurity band is caused by V in substitutional sites. The implications of our results on the observation of the quantum anomalous Hall effect at mK temperatures are discussed.

Original languageEnglish (US)
Article number184402
JournalPhysical Review B
Volume96
Issue number18
DOIs
StatePublished - Nov 2 2017

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Spectroscopic perspective on the interplay between electronic and magnetic properties of magnetically doped topological insulators'. Together they form a unique fingerprint.

  • Cite this

    Krieger, J. A., Chang, C. Z., Husanu, M. A., Sostina, D., Ernst, A., Otrokov, M. M., Prokscha, T., Schmitt, T., Suter, A., Vergniory, M. G., Chulkov, E. V., Moodera, J. S., Strocov, V. N., & Salman, Z. (2017). Spectroscopic perspective on the interplay between electronic and magnetic properties of magnetically doped topological insulators. Physical Review B, 96(18), [184402]. https://doi.org/10.1103/PhysRevB.96.184402