Different effect of quenching temperature on Fe1+σTe0.5Se0.5 and β-FeSe

In this work, we have demonstrated a different effect on Fe1+σTe0.5Se0.5 and β-FeSe by changing the quenching temperature. Tc is clearly reduced in Fe1+σTe0.5Se0.5 after increasing the quenching temperature from 300 °C to 500 °C, while that of β-FeSe is almost unchanged. Structure refinement indicat...

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Bibliographic Details
Published in:AIP advances 2015-02, Vol.5 (2), p.027119-027119-8
Main Authors: Guo, Zhongnan, Zhang, Huanhuan, Han, Bingling, Feng, Xiaojing, Yuan, Wenxia
Format: Article
Language:English
Subjects:
Iron
Quenching
Superconductivity
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Summary:In this work, we have demonstrated a different effect on Fe1+σTe0.5Se0.5 and β-FeSe by changing the quenching temperature. Tc is clearly reduced in Fe1+σTe0.5Se0.5 after increasing the quenching temperature from 300 °C to 500 °C, while that of β-FeSe is almost unchanged. Structure refinement indicates that after quenched at 500 °C, FeTe4 tetrahedron exhibits an expansion with the stretched Fe-Te bond, together with the increased amount of interstitial iron. These particular changes on structure are believed to be responsible for the suppression of superconductivity in Fe1+σTe0.5Se0.5.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4908228