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Effect of carrier density and valence states on superconductivity of oxygen annealed Fe1.06Te0.6Se0.4 single crystals
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10.1063/1.4829908
/content/aip/journal/jap/114/18/10.1063/1.4829908
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/18/10.1063/1.4829908

Figures

Image of FIG. 1.
FIG. 1.

(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 (00) reflections from the basal plane of the two single crystals.

Image of FIG. 2.
FIG. 2.

(a) Temperature dependencies of the normalized longitudinal resistivity ()/ (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 log scale for the two specimens. (c) Temperature dependencies of the magnetization at a field of 20 Oe in ZFC mode.

Image of FIG. 3.
FIG. 3.

(a) and (b) Hall resistance versus magnetic field at various temperatures for S1 and S2. (c) Hall coefficient as a function of temperature for S1 and S2. The inset is the temperature dependences of carrier density  = 1/().

Image of FIG. 4.
FIG. 4.

XPS spectra for (a) Fe-2, (b) Se-3, and (c) Te-3 from S1 and S2. The maximum and satellite peaks are indicated by arrows.

Image of FIG. 5.
FIG. 5.

Temperature dependencies of upper critical fields for S1 and S2 with // and //.

Tables

Generic image for table
Table I.

Chemical compositions, lattice parameter , , and for S1 and S2.

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/content/aip/journal/jap/114/18/10.1063/1.4829908
2013-11-08
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effect of carrier density and valence states on superconductivity of oxygen annealed Fe1.06Te0.6Se0.4 single crystals
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/18/10.1063/1.4829908
10.1063/1.4829908
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