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

Journal Article · Mon Nov 02 00:00:00 EST 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4935120· OSTI ID:22486002

Lee, H. S.; Kim, J.; Lee, K. ^[1]; Jelen, A.; Vrtnik, S.; Jagličić, Z.; Dolinšek, J. ^[2]

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1. Institute of Physics, Johannes Gutenberg-University of Mainz, 55099 Mainz (Germany)
2. J. Stefan Institute and University of Ljubljana, Jamova 39, SI-1000 Ljubljana (Slovenia)

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}.

• OSTI ID: 22486002
• Journal Information: Applied Physics Letters, Vol. 107, Issue 18; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

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