Awana, V. P. S. and -, Govind and Pal, Anand and Gahtori, Bhasker and Kaushik, S. D. and Vajpayee, A. and Kumar, Jagdish and Kishan, H. (2010) Anomalous heat capacity and x-ray photoelectron spectroscopy of superconducting FeSe1/2Te1/2. Journal of Applied Physics, 109 (7). 07E122. ISSN 1089-7550

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Abstract

The bulk polycrystalline sample FeSe1/2Te1/2 is synthesized via the solid state reaction route in an evacuated, sealed quartz tube at 750°C. The presence of superconductivity is confirmed through magnetization/thermoelectric/resistivity studies. It is found that the superconducting transition temperature (Tc) is around 12 K. The heat capacity (Cp) of superconducting FeSe1−xTex exhibits a hump near Tc, instead of a well-defined lambda transition. X-ray photoelectron spectroscopy studies reveal well-defined positions for divalent Fe, Se, and Te, but with sufficient hybridization of the Fe (2p) and Se/Te (3d) core levels. In particular, divalent Fe is shifted to a higher binding energy, and Se and Te to a lower one. The situation is similar to that observed previously for the famous Cu-based high Tc superconductors, where the Cu (3d) orbital hybridizes with O (2p). We also found the satellite peak of Fe at 712.00 eV, which is attributed to the charge-carrier localization induced by Fe at the 2c site.

Item Type:	Article
Subjects:	Applied Physics/Condensed Matter Physics
Divisions:	UNSPECIFIED
Depositing User:	Mr. Abhishek Yadav
Date Deposited:	02 Nov 2012 07:58
Last Modified:	02 Nov 2012 07:58
URI:	http://npl.csircentral.net/id/eprint/790

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