Philipp Rüßmann^1*, Abdul Tcakaev², Volodymyr B. Zabolotnyy², Celso I. Fornari^3,4,5, Thiago R. F. Peixoto^3,4, Fabian Stier², Michael Dettbarn², Philipp Kagerer^3,4, Eugen Weschke⁶, Enrico Schierle⁶, Peter Bencok⁷, Paulo H. O. Rappl⁵, Eduardo Abramof⁵, Hendrik Bentmann^3,4, Eberhard Goering⁸, Friedrich Reinert^3,4, 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.

Materials Cloud sections using this data

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

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External references

Keywords

magnetically doped topological insulators density functional theory JuKKR AiiDA-KKR