ON THE INFLUENCE OF POSSIBLE MECHANISM OF INTERPLANE INTERACTION ON HIGH Tc

1989 ◽  
Vol 03 (16) ◽  
pp. 1237-1240
Author(s):  
J. SOSNOWSKI
Keyword(s):  
Critical Temperature ◽  
Coupling Constant ◽  
High Tc ◽  
Ceramic Samples

The possible influence of attractive interplane interaction on the critical temperature of high T c ceramics is considered. The influence of the number of interacting planes, what roughly may correspond to the yttrium based and bismuth ceramic samples is investigated. The results indicate that even for relatively weak interplane coupling constant high T c connected with this interaction may be reached for appropriate spectrum of excitations.

A NEW MECHANISM OF HIGH Tc SUPERCONDUCTIVITY BY ANTIFERROMAGNETIC SPIN WAVES

1987 ◽  
Vol 01 (07n08) ◽  
pp. 315-321 ◽  
Author(s):  
KIYOSHI SOGO
Keyword(s):  
Critical Temperature ◽  
Spin Wave ◽  
Spin Waves ◽  
Coupling Constant ◽  
High Critical Temperature ◽  
High Tc ◽  
High Tc Superconductivity ◽  
Mechanism Of Superconductivity ◽  
Antiferromagnetic Spin

New mechanism of superconductivity is presented, which utilizes antiferromagnetic spin waves. It is found that for the case of Ising like anisotropy the spin wave coherence strongly enhances the superconductive coupling constant, which gives rise to a rather high critical temperature. Sloppy spin wave mechanism is also suggested.

A Self-Doped Oxygen-Free High-Critical-Temperature (High-Tc) Superconductor: SmFFeAs

2019 ◽  
Vol 58 (22) ◽  
pp. 15401-15409 ◽  
Author(s):  
Dan Lin ◽  
Han-Shu Xu ◽  
Jingjing Luo ◽  
Haoliang Huang ◽  
Yalin Lu ◽  
...  
Keyword(s):  
Critical Temperature ◽  
High Critical Temperature ◽  
High Tc ◽  
High Tc Superconductor

ENERGY BAND OVERLAPPING IN HIGH-Tc SUPERCONDUCTORS

1996 ◽  
Vol 10 (30) ◽  
pp. 1483-1490 ◽  
Author(s):  
M. MORENO ◽  
R. M. MÉNDEZ-MORENO ◽  
M. A. ORTIZ ◽  
S. OROZCO
Keyword(s):  
Weak Coupling ◽  
Cuprate Superconductors ◽  
Weak Coupling Limit ◽  
Band Model ◽  
Coupling Constant ◽  
High Tc Superconductors ◽  
Energy Bands ◽  
Effective Coupling ◽  
High Tc ◽  
Two Band Model

Multi-band superconductors are analyzed and the relevance of overlapping energy bands to the high-T c of these materials is studied. Within the BCS framework, a two band model with generalized Fermi surface topologies is developed. Values of the overlapped occupancy parameters for typical cuprate superconductors are obtained as a function of the ratio R and the effective coupling constant, λ, in the weak-coupling limit. The overlap scale is of the order or lower than the cutoff (Debye) energy. The typical behavior of the isotope effect is obtained. As these superconductors have transition temperatures above the phonon barrier, the results of this approach are important to the generic understanding of the high-T c superconducting mechanism.

Features of vortex pinning and magnetic flux creep in epitaxial thin films of high-Tc superconductor YBa2Cu3O7−δ near the critical temperature

2006 ◽  
Vol 32 (8) ◽  
pp. 832-837 ◽  
Author(s):  
M. P. Chornomorets ◽  
D. G. Kovalchuk ◽  
S. M. Ryabchenko ◽  
A. V. Semenov ◽  
E. A. Pashitskii
Keyword(s):  
Thin Films ◽  
Critical Temperature ◽  
Magnetic Flux ◽  
Vortex Pinning ◽  
Flux Creep ◽  
Epitaxial Thin Films ◽  
High Tc ◽  
High Tc Superconductor

Granular Aspects of High Tc Superconductivity

1990 ◽  
Vol 195 ◽  
Author(s):  
Guy Deutscher
Keyword(s):  
High Temperature ◽  
High Temperature Superconductivity ◽  
Original Publication ◽  
High Tc ◽  
High Tc Superconductivity ◽  
Bulk Ceramic ◽  
Ceramic Samples ◽  
Granular Superconductors

ABSTRACTAs Bednorz and Muller noted in their original publication reporting on the discovery of high temperature superconductivity, their oxides present many of the features of granular superconductors. This behavior was first primarily ascribed to poor connectivity of the grains in the bulk ceramic samples. but later studies have pointed out to more fundamental reasons for these similarities. We will discuss them after first reviewing the well established properties of low Tc granular superconductors.

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.

Electrical resistivity and critical temperature of Bi-based High-TC superconductors to 1 GPa

1990 ◽  
Vol 3 (1-6) ◽  
pp. 120-122 ◽  
Author(s):  
B. M. Andersson ◽  
K. E. Easterling ◽  
S. J. Guo ◽  
B. Sundqvist
Keyword(s):  
Electrical Resistivity ◽  
Critical Temperature ◽  
High Tc Superconductors ◽  
High Tc

How Reliable is the Cuprates System to Recent Technology?

2016 ◽  
Vol 6 (4) ◽  
pp. 1534
Author(s):  
Emetere M.E. ◽  
Awojoyogbe O.B. ◽  
Uno U.E. ◽  
Isah K.U. ◽  
Sanni E.S. ◽  
...  
Keyword(s):  
Critical Temperature ◽  
Room Temperature ◽  
Engineering Application ◽  
Experimental Results ◽  
Future Research ◽  
Mathematical Approach ◽  
Experimental Room ◽  
High Tc ◽  
High Tc Superconductor

The emergence of cuprates as a high Tc superconductor gave high hopes in the discovery of a room temperature superconductor. It is almost three decades and the highest critical temperature attained on the cuprates is about 135K. A brief overview was conducted on the progress made so far on the cuprates. A mathematical approach was used to design a formula which could determine the experimental results of critical temperature of versed cuprates superconductors. The result of our findings shows that the possibility of attaining the experimental room temperature cuprates superconductor seems very narrow. The study recommended an elaborate approach on the hybridization of cuprates for future research. Hence, there is possibility of having cuprates with wide engineering application.

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