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Title: Antiferromagnetic order competing with topological state in Ce{sub x}Bi{sub 2−x}Te{sub 3}

The topological surface states in three-dimensional topological insulators are easily tuned by chemical doping, especially by magnetic impurities. We prepared single crystals of Ce{sub x}Bi{sub 2−x}Te{sub 3} with various x (=0.04, 0.06, 0.08, 0.10, and 0.12). The obtained crystals were characterized by X-ray diffraction and scanning electron microscopy. The magnetic susceptibility data revealed that the Ce atoms are well substituted for Bi into Bi{sub 2}Te{sub 3}. From the Curie-Weiss fits, we observed that the effective magnetic moments μ{sub eff} are close to 2.54 μ{sub B} for free Ce ion, and the paramagnetic Curie-Weiss temperatures θ{sub p} are negatively increased from 2.87 K to −59.3 K with increasing x. The magnetization data clearly showed antiferromagnetic orders around T{sub N} = 4.1 K for x ≥ 0.08, where θ{sub p} suddenly increases, and the electrical resistivity is simply metallic and the magnetoresistance is parabolic. Only for x = 0.06, exotic physical properties arising from the topological states were observed such as non-metallic behavior in the electrical resistivity and linear dependence of the magnetoresistance. Moreover, the carrier concentration of x = 0.06 is one order lower than that of x ≥ 0.08. These observations propose that the antiferromagnetic order is strongly competing with the topological state in Ce{sub x}Bi{sub 2−x}Te{sub 3}.
Authors:
; ;  [1] ;  [2] ; ; ; ;  [3]
  1. Department of Physics, Sogang University, Seoul 121-742 (Korea, Republic of)
  2. Institute of Physics, Johannes Gutenberg-University of Mainz, 55099 Mainz (Germany)
  3. J. Stefan Institute and University of Ljubljana, Jamova 39, SI-1000 Ljubljana (Slovenia)
Publication Date:
OSTI Identifier:
22486002
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 18; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANTIFERROMAGNETISM; BISMUTH TELLURIDES; CARRIERS; CERIUM IONS; IMPURITIES; MAGNETIC MOMENTS; MAGNETIC SUSCEPTIBILITY; MAGNETIZATION; MAGNETORESISTANCE; MONOCRYSTALS; PARAMAGNETISM; SCANNING ELECTRON MICROSCOPY; SURFACES; THREE-DIMENSIONAL LATTICES; TOPOLOGY; X-RAY DIFFRACTION