scholarly journals Enhancement of critical temperature of a striped holographic superconductor

2012 ◽  
Vol 86 (12) ◽  
Author(s):  
Suman Ganguli ◽  
Jimmy A. Hutasoit ◽  
George Siopsis
Keyword(s):  
Critical Temperature ◽  
Holographic Superconductor

scholarly journals NON-MINIMAL RF2-TYPE CORRECTIONS TO HOLOGRAPHIC SUPERCONDUCTOR

2013 ◽  
Vol 28 (40) ◽  
pp. 1350190 ◽  
Author(s):  
ÖZCAN SERT ◽  
MUZAFFER ADAK
Keyword(s):  
Electromagnetic Field ◽  
Critical Temperature ◽  
Linear Combination ◽  
Holographic Superconductor ◽  
Analytical Analysis ◽  
Holographic Superconductors ◽  
Arbitrary Linear Combination

We study (2+1)-dimensional holographic superconductors in the presence of non-minimally coupled electromagnetic field to gravity by considering an arbitrary linear combination of RF2-type invariants with three parameters. Our analytical analysis shows that the non-minimal couplings affect the condensate and the critical temperature.

scholarly journals Exponential nonlinear electrodynamics and backreaction effects on holographic superconductor in the Lifshitz black hole background

2017 ◽  
Vol 27 (01) ◽  
pp. 1750175 ◽  
Author(s):  
Z. Sherkatghanad ◽  
B. Mirza ◽  
F. Lalehgani Dezaki
Keyword(s):  
Black Hole ◽  
Critical Temperature ◽  
Critical Magnetic Field ◽  
Nonlinear Electrodynamics ◽  
Holographic Superconductor ◽  
Dynamical Exponent ◽  
Black Hole Background ◽  
Sturm Liouville ◽  
Lifshitz Black Hole ◽  
Exponential Nonlinear Electrodynamics

We analytically describe the properties of the s-wave holographic superconductor with the exponential nonlinear electrodynamics in the Lifshitz black hole background in four-dimensions. Employing an assumption the scalar and gauge fields backreact on the background geometry, we calculate the critical temperature as well as the condensation operator. Based on Sturm–Liouville method, we show that the critical temperature decreases with increasing exponential nonlinear electrodynamics and Lifshitz dynamical exponent, [Formula: see text], indicating that condensation becomes difficult. Also we find that the effects of backreaction has a more important role on the critical temperature and condensation operator in small values of Lifshitz dynamical exponent, while [Formula: see text] is around one. In addition, the properties of the upper critical magnetic field in Lifshitz black hole background using Sturm–Liouville approach is investigated to describe the phase diagram of the corresponding holographic superconductor in the probe limit. We observe that the critical magnetic field decreases with increasing Lifshitz dynamical exponent, [Formula: see text], and it goes to zero at critical temperature, independent of the Lifshitz dynamical exponent, [Formula: see text].

scholarly journals Holographic superconductors in Born–Infeld electrodynamics and external magnetic field

2014 ◽  
Vol 29 (17) ◽  
pp. 1450088 ◽  
Author(s):  
Sunandan Gangopadhyay
Keyword(s):  
Magnetic Field ◽  
Critical Temperature ◽  
External Magnetic Field ◽  
Critical Magnetic Field ◽  
Field Equations ◽  
Holographic Superconductor ◽  
Holographic Superconductors

In this paper, we analytically investigate the effect of adding an external magnetic field in the presence of Born–Infeld (BI) corrections to a holographic superconductor in the probe limit. The technique employed is based on the matching of the solutions to the field equations near the horizon and the asymptotic AdS region. We obtain expressions for the critical temperature and the condensation values explicitly to all orders in the BI parameter. The value of the critical magnetic field is finally obtained and is found to get affected by the BI parameter.

scholarly journals ANALYTICAL STUDY OF CRITICAL MAGNETIC FIELD IN A HOLOGRAPHIC SUPERCONDUCTOR

2013 ◽  
Vol 28 (08) ◽  
pp. 1350024 ◽  
Author(s):  
D. MOMENI ◽  
EIJI NAKANO ◽  
M. R. SETARE ◽  
WEN-YU WEN
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Critical Temperature ◽  
General Feature ◽  
Analytical Study ◽  
Critical Magnetic Field ◽  
Zero Temperature ◽  
Holographic Superconductor ◽  
Holographic Superconductors ◽  
Sturm Liouville

We analytically study the effect of magnetic field in a holographic superconductor by using Sturm–Liouville method. We estimate the coefficient of proportionality at critical temperature and find its dependence on bulk magnetic field. By exploring the phase diagrams of critical temperature and magnetic field for various condensates, we conclude that the existence of critical magnetic field is a general feature in holographic superconductors. We also study the quantum phase transition at zero temperature and find that the critical charge density increases linearly with the condensate dimension.

scholarly journals Analytical Study of the Holographic Superconductor from Higher Derivative Theory

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Chunyan Wang ◽  
Dan Zhang ◽  
Guoyang Fu ◽  
Jian-Pin Wu
Keyword(s):  
Critical Temperature ◽  
Energy Gap ◽  
Mean Field ◽  
High Derivative ◽  
Temperature Limit ◽  
Holographic Superconductor ◽  
Higher Derivative ◽  
Superconducting Energy Gap ◽  
Perturbative Method ◽  
Coupling Parameters

In this paper, we analytically study the holographic superconductor models with the high derivative (HD) coupling terms. Using the Sturm-Liouville (S-L) eigenvalue method, we perturbatively calculate the critical temperature. The analytical results are in good agreement with the numerical results. It confirms that the perturbative method in terms of the HD coupling parameters is available. Along the same line, we analytically calculate the value of the condensation near the critical temperature. We find that the phase transition is second order with mean field behavior, which is independent of the HD coupling parameters. Then, in the low-temperature limit, we also calculate the conductivity, which is qualitatively consistent with the numerical one. We find that the superconducting energy gap is proportional to the value of the condensation. But we note that since the condensation changes with the HD coupling parameters, as the function of the HD coupling parameters, the superconducting energy gap follows the same change trend as that of the condensation.

scholarly journals Holographic superconductor with nonlinear Born–Infeld-type electrodynamics

2019 ◽  
Vol 34 (03n04) ◽  
pp. 1950019 ◽  
Author(s):  
S. I. Kruglov
Keyword(s):  
Critical Temperature ◽  
Order Parameter ◽  
Model Parameters ◽  
De Sitter ◽  
S Wave ◽  
Matching Method ◽  
Holographic Superconductor ◽  
Critical Temperatures ◽  
Sturm Liouville ◽  
Analytical Expressions

Holographic s-wave superconductors in the framework of nonlinear Born–Infeld-type electrodynamics are investigated in the background of Schwarzschild anti-de Sitter black holes. As particular cases, at some model parameters, we obtain results for Born–Infeld and exponential electrodynamics. We explore the analytical Sturm–Liouville eigenvalue problem in the probe limit where the scalar and electromagnetic fields do not affect the background metric. The critical temperatures of phase transitions and the order parameter are calculated which depend on the model parameters. We show that the critical exponent near the critical temperature is 1/2. Making use of the matching method, we derive analytical expressions for the condensation values and the critical temperature. The conductivity by the analytical method is calculated.

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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