Excess Conductivity of Anisotropic Inhomogeneous Superconductors Above the Critical Temperature

2019 ◽  
Vol 61 (9) ◽  
pp. 1549-1552
Author(s):  
T. I. Mogilyuk ◽  
P. D. Grigoriev ◽  
K. K. Kesharpu ◽  
I. A. Kolesnikov ◽  
A. A. Sinchenko ◽  
...  
Keyword(s):  
Critical Temperature ◽  
Excess Conductivity ◽  
Inhomogeneous Superconductors

Critical Exponents of α-Irradiated Bi-2212 Superconductors in the Paracoherence Region

1998 ◽  
Vol 12 (20) ◽  
pp. 829-837 ◽  
Author(s):  
A. K. Ghosh ◽  
S. K. Bandyopadhyay ◽  
Pintu Sen ◽  
P. Barat ◽  
A. N. Basu
Keyword(s):  
Critical Temperature ◽  
Critical Exponent ◽  
Critical Exponents ◽  
Excess Conductivity ◽  
Josephson Coupling ◽  
Coupling Energy ◽  
Particle Irradiation

The relation between the excess conductivity and the critical exponent of conductivity is discussed in the paracoherence region. The critical exponents vary with α-particle irradiation of Bi 2 Sr 2 CaCu 2 O 8+x (Bi-2212) superconductors. The role of the Harris' criteria is discussed. The normalized Josephson coupling energy is calculated and its variation temperature is plotted both for the unirradiated and irradiated Bi-2212 samples. Effects of the variation of normalized Josephson coupling energy are discussed in the light of variations of critical temperature and grain volumes.

EVIDENCE FOR ANOMALOUS FLUCTUATIONS IN SUPERCONDUCTING Bi1.75Pb0.25Ca2Sr2Cu3O10

1988 ◽  
Vol 02 (11n12) ◽  
pp. 1319-1325 ◽  
Author(s):  
M. AUSLOOS ◽  
CH. LAURENT ◽  
S.K. PATAPIS ◽  
S.M. GREEN ◽  
H.L. LUO ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Critical Temperature ◽  
Power Law ◽  
Room Temperature ◽  
Excess Conductivity ◽  
Temperature Behavior ◽  
Temperature Derivative ◽  
Superconducting Ceramics

We report very precise measurements of the electrical resistivity of granular Bi 1.75 Pb 0.25- Ca 2 Sr 2 Cu 3 O 10 superconducting ceramics from room temperature down to the superconducting percolating temperature. We analyze the temperature behavior of the excess conductivity and of the temperature derivative variation in electrical resistivity in order to extract the superconductivity fluctuation dimensionality regimes. We obtain unusual power law behaviors which do not correspond to predictions based on Aslamazov and Larkin theory (nor to its generalizations) nor to the regimes found in YBa 2 Cu 3 O 7, e.g., here, dR/dT≃E−11/6 for ln E in [−4,0] with E=|T−T c |T c , where T c is the critical temperature.

scholarly journals Conductivity of anisotropic inhomogeneous superconductors above the critical temperature

2018 ◽  
Vol 98 (1) ◽  
Author(s):  
S. S. Seidov ◽  
K. K. Kesharpu ◽  
P. I. Karpov ◽  
P. D. Grigoriev
Keyword(s):  
Critical Temperature ◽  
Inhomogeneous Superconductors

Optical properties of the Vanadium dioxide

2015 ◽  
Vol 8 (2) ◽  
pp. 2148-2155 ◽  
Author(s):  
Abderrahim Benchaib ◽  
Abdesselam Mdaa ◽  
Izeddine Zorkani ◽  
Anouar Jorio
Keyword(s):  
Energy Efficiency ◽  
Optical Properties ◽  
Critical Temperature ◽  
Thin Layer ◽  
Dielectric Function ◽  
Vanadium Dioxide ◽  
Ultra Violet ◽  
Index Of Refraction ◽  
Practical Utility ◽  
Infra Red

The vanadium dioxide is a material thermo chromium which sees its optical properties changing at the time of the transition from the phase of semiconductor state ↔ metal, at a critical temperature of 68°C. The study of the optical properties of a thin layer of VO₂ thickness 82 nm, such as the dielectric function, the index of refraction, the coefficient ofextinction, the absorption’s coefficient, the reflectivity, the transmittivity, in the photonic spectrum of energy ω located inthe interval: 0.001242 ≤ ω (ev) ≤ 6, enables us to control well its practical utility in various applications, like the intelligentpanes, the photovoltaic, paintings for increasing energy efficiency in buildings, detectors of infra-red (I.R) or ultra-violet(U.V). We will make simulations with Maple and compare our results with those of the literature

ALLEGHENY STAINLESS TYPE 405

Alloy Digest ◽  
1985 ◽  
Vol 34 (7) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Critical Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
Ductile Material ◽  
Air Cooling ◽  
Temperature Performance

Abstract ALLEGHENY STAINLESS Type 405, unlike most other 12% chromium steels, is not subject to appreciable hardening through air cooling from high temperatures. This is an advantageous characteristic in those applications where a soft, ductile material is required after rapid cooling from above the critical temperature. The nonhardening tendency of Type 405 also retards the formation of hardening cracks where welding is employed. Its uses include annealing boxes and baffles where hardening during cooling would be undesirable. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as heat treating and machining. Filing Code: SS-461. Producer or source: Allegheny Ludlum Corporation.

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