scholarly journals Standard Behaviour of Bi2Sr2CaCu2O8+δ Overdoped

2021 ◽  
Vol 6 (2) ◽  
pp. 13
Author(s):  
Giovanni Alberto Ummarino
Keyword(s):  
Experimental Data ◽  
Critical Temperature ◽  
Excellent Agreement ◽  
Free Parameter ◽  
Theoretical Calculations ◽  
Spin Fluctuations ◽  
Superconducting Gap ◽  
Eliashberg Theory ◽  
Antiferromagnetic Spin ◽  
D Wave

I calculated the critical temperature and superconducting gap in the framework of one band d wave Eliashberg theory with only one free parameter in order to reproduce the experimental data relative to Bi2Sr2CaCu2O8+δ(BSCCO) in the overdoped regime. The theoretical calculations are in excellent agreement with the experimental data and indicate that cuprates in the overdoped regime are well described by standard d-wave Eliashberg theory with coupling provided by antiferromagnetic spin fluctuations.

scholarly journals Low-energy antiferromagnetic spin fluctuations limit the coherent superconducting gap in cuprates

2018 ◽  
Vol 98 (22) ◽  
Author(s):  
Yangmu Li ◽  
Ruidan Zhong ◽  
M. B. Stone ◽  
A. I. Kolesnikov ◽  
G. D. Gu ◽  
...  
Keyword(s):  
Low Energy ◽  
Spin Fluctuations ◽  
Superconducting Gap ◽  
Antiferromagnetic Spin

CRITICAL TEMPERATURE OF LAYERED SUPERCONDUCTORS IN INTERMEDIATE e-ph COUPLING: APPLICATION TO MgB2

2006 ◽  
Vol 20 (21) ◽  
pp. 3093-3099 ◽  
Author(s):  
I. N. ASKERZADE
Keyword(s):  
Experimental Data ◽  
Critical Temperature ◽  
Qualitative Agreement ◽  
Magnesium Diboride ◽  
Layered Superconductors ◽  
Eliashberg Theory

Critical temperature of layered superconductors is studied using anisotropic Eliashberg theory in intermediate e-ph coupling. The results are shown to be in qualitative agreement with experimental data for the superconducting magnesium diboride MgB 2.

CRITICAL TEMPERATURE, ISOTOPE EFFECT AND SUPERCONDUCTING GAP IN THE MxLa2−xCuO4 AND M2RCu3O7−δ-TYPE SUPERCONDUCTORS

1988 ◽  
Vol 02 (06) ◽  
pp. 1415-1429 ◽  
Author(s):  
F. H. LIU ◽  
MARIAN APOSTOL
Keyword(s):  
Experimental Data ◽  
High Temperature ◽  
Critical Temperature ◽  
Isotope Effect ◽  
Fair Agreement ◽  
Superconducting Gap ◽  
Mechanism Of Superconductivity

The effect of the oxygen-displacive modes in the M x La 2−x CuO 4 and M 2 RCu 3 O 7−δ-type superconductors is discussed with regard to its possible relevance for a high-temperature mechanism of superconductivity. Critical temperature, isotope effect and superconducting gap are estimated in fair agreement with the experimental data.

NQR and NMR in High Tc Superconductors

1992 ◽  
Vol 47 (1-2) ◽  
pp. 7-11 ◽  
Author(s):  
K. Asayama ◽  
Y. Kitaoka ◽  
G.-q. Zheng
Keyword(s):  
High Temperature ◽  
Transition Temperature ◽  
Low Temperature ◽  
Spin Fluctuations ◽  
Superconducting Transition ◽  
High Tc Superconductors ◽  
High Tc ◽  
Pairing Correlations ◽  
Antiferromagnetic Spin ◽  
D Wave

AbstractRecent NQR and NMR experiments on La2-xSrxCuO4 , YBa2Cu3O7 , Tl2Ba2CuO6+y , and other compounds are reviewed. The antiferromagnetic spin fluctuations decrease in the order of La, Y, T1 compounds. In the normal state the T-dependence of (T1T)-1 is considered to follow the Curie- Weiss law at high temperature and the (Ti 7") = const law at low temperature. The T dependence of 1/T1 below Tc suggests strongly d-wave pairing. Correlations of the NQR frequency of 63Cu and 17O with the antiferromagnetic spin fluctuations and the superconducting transition temperature are discussed.

Convective Losses From Cavity Solar Receivers—Comparisons Between Analytical Predictions and Experimental Results

1983 ◽  
Vol 105 (1) ◽  
pp. 29-33 ◽  
Author(s):  
A. M. Clausing
Keyword(s):  
Experimental Data ◽  
Experimental Evidence ◽  
Analytical Model ◽  
Excellent Agreement ◽  
Experimental Results ◽  
Simple Analytical Model ◽  
Refined Model ◽  
Wall Area

Cavity solar receivers are generally believed to have higher thermal efficiencies than external receivers due to reduced losses. A simple analytical model was presented by the author which indicated that the ability to heat the air inside the cavity often controls the convective loss from cavity receivers. Thus, if the receiver contains a large amount of inactive hot wall area, it can experience a large convective loss. Excellent experimental data from a variety of cavity configurations and orientations have recently become available. These data provided a means of testing and refining the analytical model. In this manuscript, a brief description of the refined model is presented. Emphasis is placed on using available experimental evidence to substantiate the hypothesized mechanisms and assumptions. Detailed comparisons are given between analytical predictions and experimental results. Excellent agreement is obtained, and the important mechanisms are more clearly delineated.

Cross sections for d-3H neutron interactions with samarium isotopes

2016 ◽  
Vol 104 (8) ◽  
Author(s):  
Junhua Luo ◽  
Chunlei Wu ◽  
Li Jiang ◽  
Long He
Keyword(s):  
Experimental Data ◽  
Neutron Flux ◽  
Cross Sections ◽  
Theoretical Calculations ◽  
Nuclear Model ◽  
Activation Technique ◽  
Incident Neutron ◽  
Reaction Threshold ◽  
Talys 1.6 ◽  
The Cross

Abstract:The cross sections for (n,x) reactions on samarium isotopes were measured at (d-T) neutron energies of 13.5 and 14.8 MeV with the activation technique. Samples were activated along with Nb and Al monitor foils to determine the incident neutron flux. Theoretical calculations of excitation functions were performed using the nuclear model codes TALYS-1.6 and EMPIRE-3.2 Malta with default parameters, at neutron energies varying from the reaction threshold to 20 MeV. The results were discussed and compared with experimental data found in the literature. At neutron energies 13.5 and 14.8 MeV, the cross sections of the

scholarly journals EFFECTS OF c-AXIS HOPPING IN THE INTERLAYER TUNNELING MODEL OF HIGH-Tc LAYERED CUPRATES

1999 ◽  
Vol 13 (13) ◽  
pp. 1619-1632
Author(s):  
BIPLAB CHATTOPADHYAY ◽  
A. N. DAS
Keyword(s):  
Experimental Data ◽  
Transition Temperature ◽  
Cuprate Superconductors ◽  
Interlayer Coupling ◽  
Superconducting Gap ◽  
Tunneling Model ◽  
High Tc ◽  
Optimal Doping ◽  
Pair Tunneling ◽  
Layered Cuprates

We consider the interlayer pair-tunneling model for layered cuprates, including an effective single particle hopping along the c-axis. A phenomenological suppression of the c-axis hopping matrix element, by the pseudogap in cuprate superconductors, is incorporated. At optimal doping, quantities characteristic to the superconducting state, such as the transition temperature and the superconducting gap are calculated. Results from our calculations are consistent with the experimental observations with the noteworthy point that, the superconducting gap as a function of temperature shows excellent match to the experimental data. Predictions within the model, regarding T c variation with interlayer coupling, are natural outcomes which could be tested further.

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