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Title of Journal: Pramana J Phys

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Abbravation: Pramana

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Springer-Verlag

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10.1002/chin.201346155

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0973-7111

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Gdsubstituted Bi2223 superconductor

Authors: D R Mishra
Publish Date: 2008/07/05
Volume: 70, Issue: 3, Pages: 535-541
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Abstract

The effects of gadolinium doping at calcium site on the normal and superconducting properties of Bi2223 system were studied The Gddoped BiPb2223 series of specimens namely Batch I II and III were sintered at three different sintering temperatures 830 850 and 895°C respectively The properties investigated are 1 the normal state resistivity with a view to study metaltoinsulator transition 2 the XRD patterns of the specimens with a view to study the relative composition of BiPb2212 and BiPb2223 phases and 3 the superconducting fluctuation behaviour SFB with a view to determine the effect of doping if any on the dimensionality of the fluctuation conductivity of the system The normal state resistivity of Gdsubstituted Bi2223 specimens shows metallic semiconducting and insulating behaviour The T c R = 0 values indicate that BiPb2223 phase is responsible for the observed superconducting transitions in Batch I and Batch II specimens with Gd concentrations x ≤ 07 This observation is further confirmed in the analysis of XRD patterns of these specimens Gadolinium being a magnetic impurity has pair breaking effect near the Fermi level and decreases T c R = 0 The analysis of the superconducting fluctuation behaviour SFB shows a 2D dimensionality without any crossover

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