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Magnetic ordering in Ho-doped Bi 2 Te 3 topological insulator

DOI: 10.1002/pssr.201600061 DOI Help

Authors: A. Figueroa-garcia (Diamond Light Source) , S. E. Harrison (University of Oxford) , L. Collins-mcintyre (University of Oxford) , G. Van Der Laan (Diamond Light Source) , T. Hesjedal (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physica Status Solidi (rrl) - Rapid Research Letters

State: Published (Approved)
Published: April 2016
Diamond Proposal Number(s): 10207

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 ϑCW ≈ –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. (© 2016 WILEY-VCH Verlag GmbH &Co. KGaA, Weinheim)

Journal Keywords: topological insulators;magnetic ordering;doping;antiferromagnetism;molecular beam epitaxy;X-ray magnetic circular dichroism

Subject Areas: Physics

Instruments: I10-Beamline for Advanced Dichroism