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Effect of Interstitial Iron Defect and Doping on Physical Properties and Stability of Iron Telluride

100%

Viennois R.

Acta Physica Polonica A

2012

vol. 121

issue 4

928-931

We report on the effect of interstitial iron defect and doping on iron physical properties and stability of iron telluride by combined experimental and theoretical study. We find that antimony doping and increase iron content in interstitial effect have both the effect to slightly decrease the temperature of the magneto-structural transition T_{trans}. From stability calculations and absence of change in lattice parameters, it is suggested that insertion of antimony did not occur. Large decrease of T_{trans} down to 32 K was observed with Ni doping and our stability calculations confirm that the Ni doping is most favorable in the stability point of view. First-Principles calculations of stability of defect using supercell technique for stoichiometric FeTe indicate that the most stable defect is iron interstitial defect, by far, confirming the proposal done in the literature. Our electronic calculations indicate the appearance of large peaks around the Fermi level in the case of this defect and not just simple doping effect.

Phase Transition Diagnostic in Iron Telluride by Nonlinear Optical Experiments

51%

Kityk I., Viennois R., Plucinski K.

Acta Physica Polonica A

2012

vol. 121

issue 4

932-935

We have applied non-linear optical method (second harmonic generation (SHG) and third harmonic generation (THG)) to monitoring the phase transformation in the iron telluride compounds. The experiment was performed in the reflected geometry in which Temperature dependences of the SHG and THG have unambiguously shown that both methods are sensitive to the occurrence of the anomalies in the SHG and THG features near the phase transitions. However, the temperature positions of maxima are different, which may reflect a fact that in these two techniques the different multi-excited states interact differently with the critical bosons near the phase transitions. The role of the surface is crucial here because the surfaces are very sensitive to the presence of oxygen.

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2 Acta Physica Polonica A

2 2012

2 Viennois R.

1 Kityk I.

1 Plucinski K.

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Effect of Interstitial Iron Defect and Doping on Physical Properties and Stability of Iron Telluride

Phase Transition Diagnostic in Iron Telluride by Nonlinear Optical Experiments