6533b835fe1ef96bd129fdef
RESEARCH PRODUCT
Antiferromagnetic order competing with topological state in CexBi2−xTe3
S. VrtnikZvonko JagličićMyung-hwa JungKyujoon LeeA. JelenJungcheol KimHanju LeeJ. Dolinšeksubject
ParamagnetismMagnetizationMaterials sciencePhysics and Astronomy (miscellaneous)Magnetic momentCondensed matter physicsMagnetoresistanceElectrical resistivity and conductivityTopological insulatorAntiferromagnetismTopologyMagnetic susceptibilitydescription
The topological surface states in three-dimensional topological insulators are easily tuned by chemical doping, especially by magnetic impurities. We prepared single crystals of CexBi2−xTe3 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 Bi2Te3. From the Curie-Weiss fits, we observed that the effective magnetic moments μeff are close to 2.54 μB for free Ce ion, and the paramagnetic Curie-Weiss temperatures θp are negatively increased from 2.87 K to −59.3 K with increasing x. The magnetization data clearly showed antiferromagnetic orders around TN = 4.1 K for x ≥ 0.08, where θp 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 ...
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-11-02 | Applied Physics Letters |