Journal article
Magnetic ordering in Ho-doped Bi2Te3 topological insulator thin films
- Abstract:
- We investigate the magnetic properties of Ho-doped Bi2Te3 thin films grown by molecular beam epitaxy. Analysis of the polarized x-ray absorption spectra at the Ho M5 absorption edge gives an effective 4f magnetic moment which is ~45% of the Hund's rule ground state value. X-ray magnetic circular dichroism (XMCD) shows no significant anisotropy, which suggests that the reduced spin moment is not due to the crystal field effects, but rather the presence of non-magnetic or antiferromagnetic Ho sites. Extrapolating the temperature dependence of the XMCD measured in total electron yield and fluorescence yield mode in a field of 7 T gives a Curie-Weiss temperature of \theta_CW ~ -30 K, which suggests antiferromagnetic ordering, in contrast to the paramagnetic behavior observed with SQUID magnetometry. From the anomaly of the XMCD signal at low temperatures, a Neel temperature TN between 10 K and 25 K is estimated.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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- Files:
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(Preview, Accepted manuscript, pdf, 560.7KB, Terms of use)
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- Publisher copy:
- 10.1002/pssr.201600061
Authors
+ Engineering and Physical Sciences Research Council
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- Funding agency for:
- Collins-McIntyre, L
- Grant:
- Doctoral Training Award
+ University of Stanford
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- Funding agency for:
- Harrison, S
- Grant:
- Office of the Vice Provost for Graduate Education
+ Defense Advanced Research Projects Agency
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- Funding agency for:
- Harrison, S
- Grant:
- Office of the Vice Provost for Graduate Education
- Publisher:
- Wiley
- Journal:
- Physica Status Solidi: Rapid Research Letters More from this journal
- Volume:
- 10
- Issue:
- 6
- Pages:
- 467–470
- Publication date:
- 2016-01-01
- Acceptance date:
- 2016-04-07
- DOI:
- ISSN:
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1862-6270
- Keywords:
- Pubs id:
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pubs:614265
- UUID:
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uuid:fd07d152-b02d-48e4-9dc9-be8fb067701e
- Local pid:
-
pubs:614265
- Source identifiers:
-
614265
- Deposit date:
-
2016-04-07
Terms of use
- Copyright holder:
- WILEY-VCH Verlag GmbH & Co KGaA, Weinheim
- Copyright date:
- 2016
- Notes:
- Copyright © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the accepted manuscript version of the article. The final version is available online from Wiley-VCH Verlag at: https://doi.org/10.1002/pssr.201600061
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