Impurity scattering and order parameter symmetry in high-Tc superconductors

1995 ◽  
Vol 56 (12) ◽  
pp. 1605-1610 ◽  
Author(s):  
P.J. Hirschfeld
Keyword(s):  
Order Parameter ◽  
Impurity Scattering ◽  
High Tc Superconductors ◽  
High Tc ◽  
Parameter Symmetry ◽  
Order Parameter Symmetry

Raman scattering line shapes as a probe of the order parameter symmetry in high — Tc superconductors

1994 ◽  
Vol 235-240 ◽  
pp. 1077-1078
Author(s):  
K.P. Jain ◽  
A.K. Shukla ◽  
R. Ramakumar ◽  
Ratnamala Chatterji ◽  
M. Fukutomi
Keyword(s):  
Raman Scattering ◽  
Order Parameter ◽  
High Tc Superconductors ◽  
High Tc ◽  
Line Shapes ◽  
Parameter Symmetry ◽  
Order Parameter Symmetry

Example of how an unconventional order parameter symmetry may open new perspectives in the design of HTS Josephson junctions

2002 ◽  
Author(s):  
Francesco Tafuri ◽  
Filomena Lombardi ◽  
F. M. Granozio ◽  
F. Carillo ◽  
Fabrizio Riccia ◽  
...  
Keyword(s):  
Josephson Junctions ◽  
Order Parameter ◽  
Parameter Symmetry ◽  
Order Parameter Symmetry

Anisotropic Order Parameter in Two-Band Superconductivity

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3099-3101 ◽  
Author(s):  
P. Konsin ◽  
N. Kristoffel ◽  
P. Rubin
Keyword(s):  
Order Parameter ◽  
Equation System ◽  
Order Parameters ◽  
Band Model ◽  
Gap Equation ◽  
Narrow Region ◽  
Interband Scattering ◽  
Parameter Symmetry ◽  
Order Parameter Symmetry

A two-overlapping band model of superconductivity with s+d interband scattering is investigated. The gap equation system has been solved numerically. Solutions of pure-d and -s, or of mixed s+d nature are possible. The pure Tcd(μ) or Tcs(μ) curves determine the onset of superconductivity with temperature lowering. In the under- and over-doped region pure-symmetry orderings are preferred. Mixed ordering can exist in a narrow region of μ, becoming narrower with T rising. The peculiarities of the and spectra are reflected in the behaviour of the order parameters. Order parameter symmetry can change with T and μ.

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.

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