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TRANSPORT AND MAGNETIC PROPERTIES OF FEXBI2TE3 SINGLE CRYSTALS
Autoři: Čermák Patrik | Prokleška Jan | Krejčová Anna | Zvolská Magdalena | Drašar Čestmír
Rok: 2016
Druh publikace: ostatní - přednáška nebo poster
Strana od-do: nestránkováno
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Jazyk Název Abstrakt Klíčová slova
eng TRANSPORT AND MAGNETIC PROPERTIES OF FEXBI2TE3 SINGLE CRYSTALS Aim of this work is to contribute to the discussion of effect of doping on electric and magnetic properties of Bi2Te3. The key point is to elucidate the way of incorporation of doping atoms into host structure (matrix) and further to find a correlation between the way of incorporation of doping atoms and variation of physical parameters. As these materials contain considerable amount of native defects, the interaction of doping atoms with native defects must be included in the scenario. For this purpose, single crystals of overstoichiometric system FexBi2Te3 were prepared. Two effects were examined: (1) solubility of Fe in Bi2Te3, where x = 0; 0.02; 0.04; 0.06; 0.08; 0.1, 0.12, 0.14, 0.16 and 0.18 after three weeks annealing below melting point of host matrix; (2) equilibrium concentration of Fe (solubility) for x = 0.06 without and with annealing for 1 day, 1, 2, 3, 5, 8 and 12 weeks. These materials were characterized by XRD, SEM EDX, ICP OES and LIBS analysis. Temperature dependence of electric conductivity c, Hall coefficient RH(Bǁc), Seebeck coefficient Tc and magnetic susceptibility (Bǁc, Bc) were measured. Results of magnetic susceptibility show merely antiferromagnetic arrangement caused presumably by RKKY interaction. Effective magnetic moments per Fe ion calculated from susceptibility measurements and ICP OES concentrations give effective magnetic moment ~ 2 B. Examined materials are p-type semiconductors to 475 K. By Based on comparison of electric and magnetic properties we suppose presence of at least two types of Fe ions incorporation in octahedral coordination in both strengths of crystal field. Further research is running. topological insulators, Bi2Te3 single crystals, doping, transport properties, magnetic properties

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