scholarly journals Formation and Fluctuation-Induced Conductivity of (Tl1-xBix)Sr2CaCu2O7-δ (x = 0.1- 0.7) Superconductor

2016 ◽  
pp. 5973-5982
Author(s):  
S S.O Farhat ◽  
Keyword(s):  
Fluctuation Induced Conductivity

Fluctuation-Induced Conductivity of Carbon in Glucose-Doped MgB2 Superconductor

2016 ◽  
Vol 42 (1) ◽  
pp. 383-388 ◽  
Author(s):  
Intikhab A. Ansari ◽  
Jafar M. Parakkandy ◽  
M. Shahabuddin Shah ◽  
Mohammed Shahabuddin ◽  
Nasser S. Alzayed
Keyword(s):  
Mgb2 Superconductor ◽  
Fluctuation Induced Conductivity ◽  
Doped Mgb2

Fluctuation-Induced Conductivity of Cu0.5Tl0.5Ba2Ca2Cu2M1O10−δ (M = Si, Sn, Ge) Superconductors

2009 ◽  
Vol 22 (8) ◽  
pp. 769-774 ◽  
Author(s):  
M. Irfan ◽  
Sajid Khan ◽  
Najmul Hassan ◽  
Nawazish Ali Khan
Keyword(s):  
Fluctuation Induced Conductivity

FLUCTUATION-INDUCED CONDUCTIVITY OF POLYCRYSTALLINE Er1-xCexBa2Cu3O7-δ SUPERCONDUCTOR

2011 ◽  
Vol 25 (20) ◽  
pp. 1671-1681 ◽  
Author(s):  
YURI APARECIDO OPATA ◽  
ANDERSON ROSA KURELO ◽  
LINCOLN BRUM DE LEITE ◽  
GUSMÃO PINHEIRO ◽  
PEDRO RODRIGUES ◽  
...  
Keyword(s):  
Phase Transition ◽  
Power Law ◽  
Partial Substitution ◽  
Temperature Derivative ◽  
Electrical Measurements ◽  
Fluctuation Conductivity ◽  
Structural Distortions ◽  
Zero Resistance ◽  
Resistance State ◽  
Fluctuation Induced Conductivity

A detailed study of the effect caused by the partial substitution of Er by Ce on fluctuation conductivity of the Er 1-x Ce x Ba 2 Cu 3 O 7-δ; 0 ≤ x ≤ 0.10; is presented. The combined experimental results of structural and electrical measurements indicate that Ce substitutes Er for x ≤ 0.10 with no significant structural distortions. However, there is suppression of the superconducting state with zero-resistance state at temperatures ≥ 86.3 K. The results were analyzed in terms of the temperature derivative of the resistivity and the logarithmic temperature derivative of the conductivity to identify power-law divergences of the conductivity. The data revealed the occurrence of a two-stage intragranular-intergranular transition. Above the critical temperature, the Gaussian and critical regimes were observed. Also, from the critical exponents analysis, we observed a splitting of the pairing transition for Ce -doped samples, suggesting the occurrence of a phase separation. On approaching the zero resistance state, our results showed a power-law behavior that corresponds to a phase transition from a paracoherent to a coherent state of the granular array and which does not depend on Ce doping.

FLUCTUATION-INDUCED CONDUCTIVITY OF POLYCRYSTALLINE Er1-xTbxBa2Cu3O7-δ SUPERCONDUCTORS

2009 ◽  
Vol 23 (11) ◽  
pp. 1367-1375 ◽  
Author(s):  
ALCIONE ROBERTO JURELO ◽  
PEDRO RODRIGUES ◽  
ROSÂNGELA MENEGOTTO COSTA
Keyword(s):  
Phase Transition ◽  
Electrical Conductivity ◽  
Coherent State ◽  
Power Law ◽  
Critical Exponents ◽  
Metastable Phase ◽  
Temperature Derivative ◽  
Zero Resistance ◽  
Resistance State ◽  
Fluctuation Induced Conductivity

We have studied fluctuations on the electrical conductivity of granular compounds of Er 1-x Tb x Ba 2 Cu 3 O 7-δ(0 ≤ x ≤ 0.10) superconductors. From the temperature derivative of the resistivity, we have found that the transition proceeds in two intragranular–intergranular stages, with intergranular character accentuated for higher concentrations of terbium (x ≅ 0.10). The data also revealed the occurrence of critical regimes, as well as fluctuation regimes beyond 3D-XY. However, for higher concentrations of terbium, it was not possible to observe fluctuation regimes beyond 3D-XY, probably because TbBa 2 Cu 3 O 7-δ is a metastable phase. Below TC, on approaching the zero resistance state, our results showed a power-law behavior with critical exponents consistent with a phase transition from a paracoherent to a coherent state of the granular array.

Fluctuation-induced conductivity in melt-textured Pr-doped YBa2Cu3O7-δ composite superconductor

2017 ◽  
Vol 91 (4) ◽  
pp. 343-355 ◽  
Author(s):  
Yuri Aparecido Opata ◽  
João Frederico Haas Leandro Monteiro ◽  
Ezequiel Costa Siqueira ◽  
Pedro Júnior Rodrigues ◽  
Alcione Roberto Jurelo
Keyword(s):  
Composite Superconductor ◽  
Fluctuation Induced Conductivity

Fluctuation induced conductivity of polycrystalline MgB2 superconductor

2007 ◽  
Vol 42 (15) ◽  
pp. 6306-6309 ◽  
Author(s):  
Intikhab A. Ansari ◽  
V. P. S. Awana ◽  
Rajeev Rawat ◽  
M. Shahabuddin ◽  
M. Husain ◽  
...  
Keyword(s):  
Mgb2 Superconductor ◽  
Fluctuation Induced Conductivity
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