scholarly journals Исследование критической температуры T-=SUB=-c-=/SUB=- гомофазных сверхпроводников (Bi-=SUB=-1.7-=/SUB=-Pb-=SUB=-0.3-=/SUB=-Sr-=SUB=-2-=/SUB=-Ca-=SUB=-(n-1)-=/SUB=-Cu-=SUB=-n-=/SUB=- O-=SUB=-y-=/SUB=- (n=3, 4, 5) и вольт-амперных характеристик сэндвич-пар полупроводник InP-сверхпроводник Bi/Pb (2223, 2234, 2245)

2019 ◽  
Vol 89 (4) ◽  
pp. 583
Author(s):  
Д.Д. Гуламова ◽  
А.В. Каримов ◽  
Д.Г. Чигвинадзе ◽  
С.М. Ашимов ◽  
О.В. Маградзе ◽  
...  
Keyword(s):  
Single Phase ◽  
Nominal Composition ◽  
Superconducting Transition ◽  
Critical Temperatures ◽  
Current Voltage ◽  
Anisotropic Superconductors ◽  
Bismuth Cuprates ◽  
Current Voltage Characteristics ◽  
The Relationship

AbstractThe electrophysical properties of semiconductor–superconductor sandwich pairs (InP–Bi/Pb 2223, 2234, 2245) are investigated, in which homophase superconductors based on bismuth cuprates with high reproducible critical temperatures of superconducting transition T _ c = 107–180 K are used. The advantage of melt solar technology for obtaining superconducting materials is demonstrated. The microstructure and phase composition of strongly anisotropic superconductors with nominal composition Bi_1.7Pb_0.3Sr_2Ca_( n _– 1)Cu_ n O_ y ( n = 3, 4, 5) are researched. A technique of experimental determination of superconducting transition critical temperatures T _ c in single-phase and homophase HTSC samples is presented. The current–voltage characteristics of InP–Bi/Pb pairs are investigated. The relationship between the electrical resistance of sandwich pairs and superconductor critical temperature T _ c is established.

scholarly journals Nonlinear Response of a Superconductor of the Bi-Sr-Ca-Cu-O System to an Alternating Magnetic Field in the Superconducting Transition Temperature Range

2018 ◽  
Vol 185 ◽  
pp. 08005
Author(s):  
Alexander Sergeev ◽  
Igor Golev ◽  
Victoria Gvozdevskaya ◽  
Anastasia Barkalova
Keyword(s):  
Magnetic Field ◽  
Nonlinear Response ◽  
Alternating Magnetic Field ◽  
Resistive State ◽  
Superconducting Transition ◽  
Critical Temperatures ◽  
Temperature Range ◽  
Nonlinear Properties ◽  
Current Voltage ◽  
Current Voltage Characteristics

The nonlinear response of the superconductor of the Bi-Sr-Ca-Cu-O system in the temperature range of the superconducting transition under the action of a harmonic alternating magnetic field is experimentally studied. For multiphase superconductors having in their volume regions with distinct critical temperatures, the effect of odd harmonics in the response signal is observed. The contribution of crystallites and the system of weak bonds between the crystallites in the nonlinear response is singled out. It was found that the nonlinear properties of the investigated samples in the resistive state are determined mainly by the nonlinear current-voltage characteristics of the system of weak bonds between the crystallites.

Investigation of Density and Velocity of Abrikosov Vortices in YBa2Cu3O7–x Superconducting Thin Films with a Laser-Written Channel for Easy Vortex Motion

1970 ◽  
Vol 17 (2) ◽  
pp. 180-185
Author(s):  
Lina STEPONAVICIENE ◽  
Jonas SULCAS ◽  
Arturas JUKNA ◽  
Valentina PLAUSINAITIENE ◽  
Adulfas ABRUTIS ◽  
...  
Keyword(s):  
Vortex Motion ◽  
Limited Range ◽  
Coherent Motion ◽  
Superconducting Transition ◽  
Magnetic Vortices ◽  
Current Voltage ◽  
Coherent Vortex ◽  
Current Voltage Characteristics ◽  
Abrikosov Vortices

The 0.3-mm-thick, 50-mm-wide and 100-mm-long YBa2Cu3O7-x superconducting bridges with a laser-written, single, Π-shaped channel have been investigated by means of electronic transport measurements at temperatures below the onset of the bridge's superconducting transition temperature. Our results demonstrate that the coherent vortex motion confined in the P-shaped channel can be used for determination of both the density and velocity of Abrikosov magnetic vortices in the channel. The coherent motion of Abrikosov vortices expresses itself as Josephson-like voltage steps, observed on the current-voltage characteristics of our microbridges, measured at zero external magnetic field, in a limited range of temperatures and bias currents. The steps' amplitude corresponds to the entrance of an additional vortex-antivortex pair into the channel's area and change in the vortex velocity. This amplitude also affects the increase of the Lorentz force for energy dissipative drift of the magnetic flux in the channel, but it does not increase, however, with the increase of the biasing current. We present and discuss the results of experimentally measured and calculated energy dissipation, which originated from variations in the vortex density and velocity when the vortices are moving along the channel of the superconducting bridge.http://dx.doi.org/10.5755/j01.ms.17.2.489

scholarly journals Десять способов определения площади полевой эмиссии

2019 ◽  
Vol 89 (10) ◽  
pp. 1615
Author(s):  
Е.О. Попов ◽  
А.Г. Колосько ◽  
М.А. Чумак ◽  
С.В. Филиппов
Keyword(s):  
Field Emission ◽  
Anomalous Behavior ◽  
Emission Data ◽  
Voltage Level ◽  
Emission Area ◽  
Current Voltage ◽  
Effective Emission Area ◽  
Current Voltage Characteristics ◽  
The Relationship

A variety of types for formal determination of one of the main parameters of field emission systems - the emission area was investigated. Using hemisphere on a cylindrical post model built using the COMSOL Multiphysics software package the relationship between known types of emission area estimation was shown. The corresponding values of emission currents were calculated. It was shown that the formal emission area (the ratio of the total current to the current density at the top) provides only ~ 75% of the emission current value. The effect of the anomalous behavior of the effective emission area (intercept of the trend line of current-voltage characteristics) is obtained when the voltage level changes in standard Fowler-Nordheim coordinates. A method for an experimental estimate of the field emission area using the modified Fowler-Nordheim coordinates ln (I/U^(2-η/6)) vs 1/U is proposed. The method is applied to the analysis of field emission data of a multi-tip nanocomposite emitter with carbon nanotubes.

Resistive Width of Superconducting Transition in Titanium Nitride Thin Film

2011 ◽  
Vol 6 (2) ◽  
pp. 50-56
Author(s):  
Svetlana V. Postolova ◽  
Alexey Yu. Mironov ◽  
Tatyana I. Baturina
Keyword(s):  
Transition Temperature ◽  
Titanium Nitride ◽  
Electron Interaction ◽  
Nitride Film ◽  
Superconducting Transition ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
Superconducting Fluctuations ◽  
Width Of Superconducting Transition ◽  
Titanium Nitride Film

The transition to the superconducting state of the ultrathin (5 nm thick) titanium nitride film was studied. It is found that the nonmonotonic temperature dependence of the resistance, R(T), is a consequence of competition between the contributions to conductivity from quantum corrections stemming from the electron-electron interaction in the diffusion and Cooper channels. It is shown that the appreciable decrease in the resistance at T > Tc (Tc is the superconducting transition temperature) results from the superconducting fluctuations. We present the results of the analysis of low-temperature (T < Tc ) current-voltage characteristics V(I). It is found that they follow the power-law behavior V∝ I α(T) , with α(T) increasing rapidly with the decreasing temperature. The Berezinskii-Kosterlitz-Thouless transition temperature, TBKT, and width of the superconducting transition ∆T = Tc − TБКТ were determined

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