Browsing 2009 by Author "Sarun, P M"

Now showing items 1-15 of 15

Analysis of Thermo-magnetic Fluctuations in Bi1.6Pb0.5Sr2−xLuxCa1.1Cu2.1O8+ı (0.000≤x≤0.125) Superconductor

Vinu, S; Sarun, P M; Shabna, R; Syamaprasad, U (Elsevier, 2009)

The effect of substitution of rare-earth Lu on the glass transition temperature (Tg), the temperature and magnetic field dependent activation energy [U0(B,T)] and flux pinning properties of Bi1.6Pb0.5Sr2−xLuxCa1.1Cu2.1O8+ı ...
Doping Controlled Metal to Insulator Transition in the (Bi, Pb)-2212 System

Shabna, R; Sarun, P M; Vinu, S; Biju, A; Syamaprasad, U (IOP Publishing, 2009-04)

We report on the details of the metal?insulator transition in the Bi1.7Pb0.4Sr2-xPrxCa1.1Cu2.1O8+?system, in the concentration range of x = 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.3 and 1.5. In addition to the electrical ...
Doping Dependent Metal to Insulator Transition in the (Bi, Pb)-2212 System: The Evolution of Structural and Electronic Properties with Europium Substitution

Shabna, R; Sarun, P M; Vinu, S; Syamaprasad, U (IOP Publishing, 2009-09)

The present work investigates the effect of europium substitution on the (Bi, Pb)-2212 system in the concentration range 0.5 ≤ x ≤ 1.0. Phase analysis and lattice parameter calculations on the powder diffraction data and ...
Effect of sintering temperature on the microstructural and flux pinning characteristics of Bi1.6Pb0.5Sr1.8La0.2Ca1.1Cu2.1O8+delta ceramics

Sarun, P M; Vinu, S; Shabna, R; Biju, A; Guruswamy, P; Syamaprasad, U (Wiley, 2009)

We evaluated the microstructure, superconducting, and flux pinning properties of La-doped (Bi,Pb)-2212 bulk sample by varying its sintering temperature (T-sinter) between 846 degrees and 860 degrees C. Significant variations ...
Erratum: Enhancement of critical current density and flux pinning properties of Gd-doped (Bi,Pb)-2212 superconductor (Jl Appl Physics Vol 104, 043905, 2008)

Vinu, S; Sarun, P M; Shabna, R; Syamaprasad, U (American Institute of Physics, 2009)
Highly Enhanced Superconducting Properties of Bi-2212 by Y and Pb Co-doping

Sarun, P M; Shabna, R; Vinu, S; Biju, A; Syamaprasad, U (Elsevier, 2009-05-01)

The effects of Y and Pb co-doping on phase evolution, microstructure, electrical and superconducting properties of Bi-2212 have been studied. The results show that Y3+ ions enter into the crystal structure by replacing ...
Influence of Ho-doping on the electromagnetic field-dependent E-J characteristics of (Bi,Pb)-2212 superconductor

Sarun, P M; Vinu, S; Shabna, R; Biju, A; Guruswamy, P; Syamaprasad, U (IEEE, 2009)

The magnetic field (B) dependence of electric field versus transport current density (E-J characteristics) of Bi(1.6)Pb(0.5)Sr(2-x)Ho(x)Ca(1.1)Cu(2.1)O(8+delta) superconductor was studied for x from 0.000 to 0.200. The ...
Influence of Sintering Temperature on Microstructure, Critical Current Density and Pinning Potential of Superconducting Bi1.6Pb0.5Sr1.8Dy0.2Ca1.1Cu2.1O8þd Ceramics

Vinu, S; Sarun, P M; Shabna, R; Biju, A; Guruswamy, P; Syamaprasad, U (Elsevier, 2009-06)

The influence of sintering temperature on the microstructure, critical current density (JC), pinning potential values (U0) and flux pinning properties of Bi1.6Pb0.5Sr1.8Dy0.2Ca1.1Cu2.1O8+δ superconductor has been investigated. ...
Investigation of Self- and In-field Dependent n-value of Tb-doped (Bi,Pb) - 2212 Superconductor

Sarun, P M; Vinu, S; Shabna, R; Syamaprasad, U (AIP Publishing, 2009)

Knowledge of the electric field versus current density (E-J)(E-J)characteristics is very important for the development of superconducting high-field magnets particularly for operation in the persistent mode. A systematic ...
Microstructural and Superconducting Properties of Yb-substituted (Bi,Pb)-2212 Superconductor Sintered at Different Temperatures

Sarun, P M; Vinu, S; Shabna, R; Biju, A; Syamaprasad, U (Elsevier, 2009-03-20)

The influence of sintering temperature on the microstructure and superconducting properties of Bi1.7Pb0.4Sr1.8Yb0.2Ca1.1Cu2.1O8+δ has been investigated. Yb-free (Bi1.7Pb0.4Sr2.0Ca1.1Cu2.1O8+δ) and Yb-substituted ...
Properties of Superconducting, Polycrystalline Dysprosium-doped Bi1.6Pb0.5Sr2−xDyxCa1.1Cu2.1O8+δ (0 ≤ x ≤ 0.5)

Sarun, P M; Vinu, S; Shabna, R; Biju, A; Syamaprasad, U (Elsevier, 2009-05-06)

The structural and superconducting properties of dysprosium (Dy) doped (Bi,Pb)-2212 superconductor have been studied. Dy concentration is varied from x = 0.0 to 0.5 in a general stoichiometry of Bi1.6Pb0.5Sr2−xDyxCa1.1Cu2.1O8+δ. ...
Refinement of Microstructure and Highly Improved Electrical Properties of Bi1.6Pb0.5Sr1.925Ho0.075Ca1.1Cu2.1O8+δBi1.6Pb0.5Sr1.925Ho0.075Ca1.1Cu2.1O8+δ Superconductor

Vinu, S; Sarun, P M; Shabna, R; Syamaprasad, U (AIP Publishing, 2009)

The importance of rare-earth (RE) doping and precise tuning of sintering temperature on the microstructural features, electrical properties, and magnetic performance of a (Bi,Pb)-2212 superconductor sintered between 846 ...
Scaling of the vortex-liquid resistivity and temperature and magnetic field dependent activation energy in Ho doped (Bi, Pb)-2212 superconductor

Vinu, S; Sarun, P M; Shabna, R; Biju, A; Syamaprasad, U (American Institute of Physics, 2009)

The vortex-liquid resistivity close to the vortex glass to liquid transition region is analyzed in detail for Ho doped (Bi, Pb)-2212 superconductor. A large broadening of resistive transition in magnetic field is observed, ...
Structural and Electrical Properties of Bi1.7Pb0.4Sr2−xHoxCa1.1Cu2.1O8+δ System Across the Metal to Insulator Transition

Shabna, R; Sarun, P M; Vinu, S; Syamaprasad, U (Elsevier, 2009-07-29)

The structural and electrical properties of Bi1.7Pb0.4Sr2−xHoxCa1.1Cu2.1O8+δ (0.5 ≤ x ≤ 1.0) system, synthesized by solid state reaction technique are reported across the metal to insulator transition (MIT). The system ...
Transport properties near the metal to insulator transition in samarium substituted (Bi,Pb)-2212 system

Shabna, R; Sarun, P M; Vinu, S; Syamaprasad, U (American Institute of Physics, 2009)

The electrical transport properties of insulating and superconducting samples of Bi(1.7)Pb(0.4)Sr(2 x)Sm(x)Ca(1.1)Cu(2.1)O(8+delta) system is studied across the metal to insulator transition (MIT) region by varying the x ...

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