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Magnetic and structural transitions in the iron-chalcogenide high-Tc superconductor: K0.8Fe1.76Se2.00
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Mössbauer spectrum at 6 K of K0.80Fe1.76Se2.00. The spectrum was fitted using a full Hamiltonian code. The blue sextet is the magnetic component, the red doublet is an impurity and the solid green line through the data is the sum of the two components. Lines 2 and 5 of the magnetic sextet are marked.

Image of FIG. 2.
FIG. 2.

(Color online) The hyperfine field (B hf) of the antiferromagnetic subspectrum of K0.80Fe1.76Se2.00. B hf(T) was fitted using a T 3/2 law (dotted red line), and a T 3/2 law with a SEG (solid green line) up to 200 K. The SEG was found to be 9 ± 1 meV. The inset shows B hf(T) close to the superconducting transition (T sc), marked as the dashed magenta line.

Image of FIG. 3.
FIG. 3.

(Color online) The integrated spectral area, ζ, fitted using a Debye-Waller model giving θD  = 195 ± 2 K. The insets show ζ: (top right) near the superconducting transition, the magenta line, and (bottom left) the magnetic transition, the blue line.

Image of FIG. 4.
FIG. 4.

(Color online) Mössbauer spectra of K0.80Fe1.76Se2.00. The fits to the spectra, made using a full Hamiltonian solution, are shown as solid red lines.

Image of FIG. 5.
FIG. 5.

(Color online) of K0.80Fe1.76Se2.00 determined from the Mössbauer spectra shown in Fig. 4. The lower inset shows the spectral linewidth (Γ) while the upper inset shows the fractional areas of the magnetic (blue □) and paramagnetic (green ○) components. The Néel temperature, TN  = 532 ± 2 K, is marked by the dashed blue line.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetic and structural transitions in the iron-chalcogenide high-Tc superconductor: K0.8Fe1.76Se2.00