Magnetic ordering in Ho-doped Bi2Te3 topological insulator

A. I. Figueroa, S. E. Harrison, L. J. Collins-Mcintyre, G. van der Laan, T. Hesjedal*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

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 θ 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 Néel temperature TN between 10 K and 25 K is estimated.

Original languageEnglish
Pages (from-to)467-470
JournalPhysica Status Solidi - Rapid Research Letters
Volume10
Issue number6
Early online date14 Apr 2016
DOIs
Publication statusPublished - Jun 2016

Keywords

  • Antiferromagnetism
  • Doping
  • Magnetic ordering
  • Molecular beam epitaxy
  • Topological insulators
  • X-ray magnetic circular dichroism

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