Liyanawaduge, N. P. and Singh, Shiva Kumar and Kumar, Anuj and Awana, V. P. S. and Kishan, H. (2010) Superconducting and Magnetic Properties of Zn-doped YBa2 Cu3 O7−δ. Journal of Superconductivity and Novel Magnetism, 24 (5). pp. 1599-1605. ISSN 1557-1947

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Abstract

The superconducting properties and AC/DC magnetic properties of YBa2 Cu3−x Znx O7−δ , (x = 0.0, 0.01,0.03, 0.05, 0.10 and 0.15) compounds were investigated. Samples were synthesized through solid-state reaction route. X-ray diffraction data confirms the single-phase orthorhom- bic/tetragonal crystallization for the studied samples. Thermo-Gravimetric Analysis (TGA) was done for pure and Zn-doped YBa2 Cu3 O7−δ (YBCO) samples. Results re- veal that at higher dopant levels the doped samples are more oxygen-deficient than the undoped ones. The super- conducting properties of YBa2 Cu3−x Znx O7−δ system al- ways enhance with addition of oxygen to Cu–O chains, which causes enhancement of superconducting carrier den- sity together with orthorhombic structure. Zn substitution causes an overall reduction of superconducting condensa- tion energy with systematic degradation of superconduct- ing properties like Tc and Jc . This occurs via induced non- homogeneity of hole carrier density created by extended na- ture of perturbation on electronic structure in CuO2 planes and its weak-link type behavior. AC susceptibility measure- ment reveals that Zn doping reduces the inter-granular cou- plings. Scanning Electron Microscope (SEM) images indi- cate that increment of average grain size with increasing of Zn concentration.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Springer Verlag.
Uncontrolled Keywords:	Doped YBCO; TGA; AC susceptibility; Intra-grain; I nter-grain
Subjects:	Physics
Divisions:	UNSPECIFIED
Depositing User:	Mr. Abhishek Yadav
Date Deposited:	17 Oct 2012 12:03
Last Modified:	17 Oct 2012 12:03
URI:	http://npl.csircentral.net/id/eprint/714

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