(a) The photos for the as-grown specimen S1 and oxygen annealed specimen S2 on a millimeter grid. The grey white region in S2 is the inner part by scraping the cyan surface. (b) Profiles of EDX for S1 and S2. (c) X-ray diffraction scans showing the (00l) reflections from the basal plane of the two single crystals.
(a) Temperature dependencies of the normalized longitudinal resistivity ρxx (T)/ρxx (300 K) of S1 and S2. The inset shows the enlarged region of low temperature resistivity. (b) Resistivity as a function of temperature plotted on the logT scale for the two specimens. (c) Temperature dependencies of the magnetization at a field of 20 Oe in ZFC mode.
(a) and (b) Hall resistance Rxy versus magnetic field H at various temperatures for S1 and S2. (c) Hall coefficient RH as a function of temperature for S1 and S2. The inset is the temperature dependences of carrier density nH = 1/(eRH ).
XPS spectra for (a) Fe-2p, (b) Se-3d, and (c) Te-3d from S1 and S2. The maximum and satellite peaks are indicated by arrows.
Temperature dependencies of upper critical fields Hc 2 for S1 and S2 with H//c and H//ab.
Chemical compositions, lattice parameter c, , and for S1 and S2.
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