Field induced transition of the AC susceptibility in high-Tc superconductors

1996 ◽  
Vol 46 (S3) ◽  
pp. 1589-1590 ◽  
Author(s):  
Oliver Waldmann ◽  
Gerald Lichtschlag ◽  
Florian Steinmeyer ◽  
Andrei Talalaevskii ◽  
Paul Müller
Keyword(s):  
Ac Susceptibility ◽  
High Tc Superconductors ◽  
High Tc

Ac Susceptibility Studies of the High Tc Superconductors: Dissipative Effects in La2.xSrxCuO4-Y and YBa2Cu3O7-Y Systems

1989 ◽  
Vol 169 ◽  
Author(s):  
Xinsheng Ling ◽  
M. E. Filipkowski ◽  
E. K. Heller ◽  
J. I. Budnick
Keyword(s):  
Grain Boundaries ◽  
Order Parameter ◽  
Ac Susceptibility ◽  
Similar Process ◽  
Charge Carrier Density ◽  
High Tc Superconductors ◽  
High Tc ◽  
Spatial Fluctuation ◽  
Dissipative Effects ◽  
Ceramic Samples

AbstractWe have studied the variation of dissipative effects with doping in the high Tc superconductors La2-xSrxCuO4-y and YBa2Cu3O7-y by studying the lossy component of ac susceptibility as a function of temperature. We find relatively strong excess losses at low temperature in both systems, which indicate stronger flux creep at grain boundaries, in lower level doped ceramic samples produced by a similar process. This effect is more significant in the La2-xSrxCuO4-y (214) system than in the YBa2Cu3O7-y(123) system. We suggest that the microscopic mechanisms of weakening of the order parameter in the grain boundaries may be different in the two systems. In the 214 system, as the charge carrier density in the CuO2 planes is reduced, the spatial fluctuation of the order parameter in the CuO2 planes is enhanced. In the 123 system, the initial removal of O from the sample, which weakens the coupling between planes and increases the spatial fluctuation of the order parameter between CuO2 planes. The grain boundaries are degraded in both systems. The degradation in the 214 samples is more significant than in the 123 samples.

AC susceptibility and local intergranular magnetic field in high-Tc superconductors

1993 ◽  
Vol 214 (1-2) ◽  
pp. 111-118 ◽  
Author(s):  
P. Levy ◽  
H. Ferrari ◽  
V. Bekeris ◽  
C. Acha
Keyword(s):  
Magnetic Field ◽  
Ac Susceptibility ◽  
High Tc Superconductors ◽  
High Tc

AC susceptibility of the sintered Bi1.6Pb0.4Sr2(Ca1-xMx)2Cu3Oδbulk high-Tc superconductors

2001 ◽  
Vol 689 ◽  
Author(s):  
Malik I Adam ◽  
Abdul Halim Shaari ◽  
Zainul A Hassan ◽  
Kaida Khalid
Keyword(s):  
Ac Susceptibility ◽  
Field Amplitude ◽  
Nominal Composition ◽  
Temperature Peak ◽  
High Tc Superconductors ◽  
Reaction Route ◽  
Pinning Mechanism ◽  
High Tc ◽  
Ac Field ◽  
Qualitative Discussion

ABSTRACTAC susceptibility measurements as a function of temperature, frequency and applied ac field amplitude were performed on two rectangular bar shaped samples of nominal composition Bi1.6Pb0.4Sr2(Ca1-xMx)2Cu3Oδ, with M=Pr, Gd, and x=0.01, obtained by the usual solid state reaction route. The incorporation of the rare earth elements at low concentration stage results in an improvement of grain connectivity for the sample doped with Pr. On the other end, the ac field amplitude and frequency dependence of the susceptibility curves disclosed bulk pinning hystersis loss feature. The potential barrier height, activation energy at the grain boundary extracted from the low temperature peak revealed that flux creep is governing the pinning mechanism inside the samples. Qualitative discussion in the framework of the critical state model was highlighted

AC susceptibility of sintered high Tc superconductors — Bean's model and shielding current

1989 ◽  
Vol 69 (4) ◽  
pp. 367-371 ◽  
Author(s):  
S.D. Murphy ◽  
K. Renouard ◽  
R. Crittenden ◽  
S.M. Bhagat
Keyword(s):  
Ac Susceptibility ◽  
High Tc Superconductors ◽  
High Tc

AC susceptibility of high-Tc superconductors

1992 ◽  
Vol 201 (3-4) ◽  
pp. 325-336 ◽  
Author(s):  
Y. Yang ◽  
C. Beduz ◽  
Z. Yi ◽  
R.G. Scurlock
Keyword(s):  
Ac Susceptibility ◽  
High Tc Superconductors ◽  
High Tc

Hysteretical temperature dependence of AC susceptibility in granular high-Tc superconductors

1994 ◽  
Vol 234 (1-2) ◽  
pp. 49-56 ◽  
Author(s):  
V. Bekeris ◽  
H. Ferrari ◽  
C. Acha ◽  
P. Levy ◽  
G. Polla ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Ac Susceptibility ◽  
High Tc Superconductors ◽  
High Tc
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