This title appears in the Scientific Report :
2020
Please use the identifier:
http://hdl.handle.net/2128/26570 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevB.102.184401 in citations.
Incipient antiferromagnetism in the Eu-doped topological insulator Bi 2 Te 3
Incipient antiferromagnetism in the Eu-doped topological insulator Bi 2 Te 3
Rare-earth ions typically exhibit larger magnetic moments than transition-metal ions and thus promise the opening of a wider exchange gap in the Dirac surface states of topological insulators. Yet in a recent photoemission study of Eu-doped Bi2Te3 films, the spectra remained gapless down to T=20 K....
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Personal Name(s): | Tcakaev, A. |
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Zabolotnyy, V. B. (Corresponding author) / Fornari, C. I. / Rüßmann, P. / Peixoto, T. R. F. / Stier, F. / Dettbarn, M. / Kagerer, P. / Weschke, E. / Schierle, E. / Bencok, P. / Rappl, P. H. O. / Abramof, E. / Bentmann, H. / Goering, E. / Reinert, F. / Hinkov, V. (Corresponding author) | |
Contributing Institute: |
Quanten-Theorie der Materialien; IAS-1 JARA - HPC; JARA-HPC JARA-FIT; JARA-FIT Quanten-Theorie der Materialien; PGI-1 |
Published in: | Physical Review B Physical review / B, 102 102 (2020 2020) 18 18, S. 184401 184401 |
Imprint: |
Woodbury, NY
Inst.
2020
|
DOI: |
10.1103/PhysRevB.102.184401 |
Document Type: |
Journal Article |
Research Program: |
Controlling Configuration-Based Phenomena Controlling Spin-Based Phenomena |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1103/PhysRevB.102.184401 in citations.
Rare-earth ions typically exhibit larger magnetic moments than transition-metal ions and thus promise the opening of a wider exchange gap in the Dirac surface states of topological insulators. Yet in a recent photoemission study of Eu-doped Bi2Te3 films, the spectra remained gapless down to T=20 K. Here we scrutinize whether the conditions for a substantial gap formation in this system are present by combining spectroscopic and bulk characterization methods with theoretical calculations. For all studied Eu doping concentrations, our atomic multiplet analysis of the M4,5 x-ray absorption and magnetic circular dichroism spectra reveals a Eu2+ valence and confirms a large magnetic moment, consistent with a 4f78S7/2 ground state. At temperatures below 10 K, bulk magnetometry indicates the onset of antiferromagnetic (AFM) ordering. This is in good agreement with density functional theory, which predicts AFM interactions between the Eu impurities. Our results support the notion that antiferromagnetism can coexist with topological surface states in rare-earth-doped Bi2Te3 and call for spectroscopic studies in the Kelvin range to look for novel quantum phenomena such as the quantum anomalous Hall effect. |