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Incipient antiferromagnetism in the Eu-doped topological insulator Bi2Te3

Philipp Rüßmann1*, Abdul Tcakaev2, Volodymyr B. Zabolotnyy2, Celso I. Fornari3,4,5, Thiago R. F. Peixoto3,4, Fabian Stier2, Michael Dettbarn2, Philipp Kagerer3,4, Eugen Weschke6, Enrico Schierle6, Peter Bencok7, Paulo H. O. Rappl5, Eduardo Abramof5, Hendrik Bentmann3,4, Eberhard Goering8, Friedrich Reinert3,4, Vladimir Hinkov2

1 Peter Grünberg Institut and Institute for Advanced Simulation (PGI-1/IAS-1), Forschungszentrum Jülich and JARA, D-52425 Jülich

2 Experimentelle Physik IV and Röntgen Research Center for Complex Materials (RCCM), Fakultät für Physik und Astronomie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

3 Experimentelle Physik VII and Röntgen Research Center for Complex Materials (RCCM), Fakultät für Physik und Astronomie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

4 Würzburg-Dresden Cluster of Excellence ct.qmat, Germany

5 Laboratório Associado de Sensores e Materiais, Instituto Nacional de Pesquisas Espaciais, Sao José dos Campos, 12245-970, Sao Paulo, Brazil

6 Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, D-12489 Berlin, Germany

7 Diamond Light Source, Didcot OX11 0DE, United Kingdom

8 Max-Planck-Institute for Intelligent Systems, Heisenbergstraße 3, 70569 Stuttgart, Germany

* Corresponding authors emails: p.ruessmann@fz-juelich.de
DOI10.24435/materialscloud:30-5z [version v1]

Publication date: Oct 22, 2020

How to cite this record

Philipp Rüßmann, Abdul Tcakaev, Volodymyr B. Zabolotnyy, Celso I. Fornari, Thiago R. F. Peixoto, Fabian Stier, Michael Dettbarn, Philipp Kagerer, Eugen Weschke, Enrico Schierle, Peter Bencok, Paulo H. O. Rappl, Eduardo Abramof, Hendrik Bentmann, Eberhard Goering, Friedrich Reinert, Vladimir Hinkov, Incipient antiferromagnetism in the Eu-doped topological insulator Bi2Te3, Materials Cloud Archive 2020.128 (2020), doi: 10.24435/materialscloud:30-5z.

Description

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=20K. 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 4f7 8S7/2 ground state. At temperatures below 10K, 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.

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Files

File name Size Description
README.txt
MD5md5:44213a8663f503d748421137465adcdb
3.6 KiB Description of the dataset files
aiida_export_Eu_Bi2Te3_small.zip
MD5md5:15b839518ba6c4ecadb329a478d79146
1.3 GiB AiiDA export file of the dataset
export_j_of_r_ueff=825.txt
MD5md5:b7460d1e6fb461f6acadfa7751b31359
206 Bytes Table of J(r) values presented in the publication
export_dos_j_of_e_ueff=825.txt
MD5md5:e314f8f500350726748551f62f934b53
14.8 KiB Table of J(E) and DOS values presented in the publication

License

Files and data are licensed under the terms of the following license: Creative Commons Attribution 4.0 International.
Metadata, except for email addresses, are licensed under the Creative Commons Attribution Share-Alike 4.0 International license.

External references

Preprint (Paper where the data is discussed)
Software (DFT code used in the calculations)
Software (The aiida-kkr plugin)
Preprint (Paper where the aiida-kkr plugin is introduced)

Keywords

magnetically doped topological insulators density functional theory JuKKR AiiDA-KKR

Version history:

2020.128 (version v1) [This version] Oct 22, 2020 DOI10.24435/materialscloud:30-5z