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Title of Journal: J Supercond Nov Magn

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Abbravation: Journal of Superconductivity and Novel Magnetism

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Springer US

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1557-1947

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Enhancement in the Superconductivity of TlBaSubs

Authors: Nawazish A Khan Sajjad Hussain
Publish Date: 2012/09/05
Volume: 26, Issue: 2, Pages: 337-342
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Abstract

Mgdoped TlBa2−x Mg x Ca1Be1Cu3O10−δ x=0 025 05 075 superconductors are synthesized at the normal pressure and the possible mechanism of superconductivity in these compounds is studied TlBa2−x Mg x Ca1Be1Cu3O10−δ samples have shown an orthorhombic crystal structure and their caxis length decreases with Mg doping In these studies we have investigated the role of decreased thickness of charge reservoir layer in the mechanism of superconductivity The T cR=0 in asprepared TlBa2−x Mg x Ca1Be1Cu3O10−δ x=00 025 05 075 samples was 97 99 100 94 K and in oxygen postannealed samples the T cR=0 is observed at 100 98 103 101 K respectively The magnitude of the superconductivity after Mg doping is improved in TlBa2−x Mg x Ca1Be1Cu3O10−δ x=0 025 05 075 samples It was observed from the FTIR absorption measurements that the phonon modes related to CuO2 planar oxygen atoms are hardened with the doping of Mg in the charge reservoir layer These studies have shown that the thickness of charge reservoir layer decreases with Mg doping which most likely makes charge transfer mechanism more efficient promoting increase in the magnitude of superconductivity

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