Josephson tunneling for magnetic fields perpendicular to discrete Nb junctions: Implications for the irreversibility crossover in high-temperature superconductors

1992 ◽  
Vol 45 (13) ◽  
pp. 7563-7565 ◽  
Author(s):  
D. H. Kim ◽  
K. E. Gray ◽  
J. H. Kang
Keyword(s):  
High Temperature ◽  
Magnetic Fields ◽  
High Temperature Superconductors ◽  
Josephson Tunneling

Small, modular and economically attractive fusion enabled by high temperature superconductors

2019 ◽  
Vol 377 (2141) ◽  
pp. 20180354 ◽  
Author(s):  
Dennis Whyte
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Magnetic Fields ◽  
Current Density ◽  
High Temperature Superconductors ◽  
Fusion Energy ◽  
High Magnetic Fields ◽  
Operating Temperatures ◽  
The Magnetic Field ◽  
Game Changer

The advantages of high magnetic fields in tokamaks are reviewed, and why they are important in leading to more compact tokamaks. A brief explanation is given of what limits the magnetic field in a tokamak, and why high temperature superconductors (HTSs) are a game changer, not just because of their higher magnetic fields but also for reasons of higher current density and higher operating temperatures. An accelerated pathway to fusion energy is described, defined by the SPARC and ARC tokamak designs. This article is part of a discussion meeting issue ‘Fusion energy using tokamaks: can development be accelerated?’.

Important Considerations for Processing Bi-Based High-Temperature Superconducting Tapes and Films for Bulk Applications

MRS Bulletin ◽  
1992 ◽  
Vol 17 (8) ◽  
pp. 45-51 ◽  
Author(s):  
Eric E. Hellstrom
Keyword(s):  
High Temperature ◽  
Magnetic Fields ◽  
Materials Science ◽  
Weak Link ◽  
High Temperature Superconductors ◽  
Electromagnetic Properties ◽  
High Magnetic Fields ◽  
Large Current ◽  
Current Densities ◽  
Made In

High-temperature superconductors are brittle oxide ceramics, yet they have been made into wire that has been wrapped into solenoids and used in demonstration magnets and motors. Fabricating wires from these ceramics is an extremely challenging materials science process that requires a precisely engineered microstructure with the correct chemical, mechanical, and electromagnetic properties if these wires are to transport large current densities (Jc) in high magnetic fields. Heine et al. first demonstrated that wires of these materials could carry high Jc in very high magnetic fields. At 4.2 K, the oxide superconducting wires can carry higher Jc at higher magnetic fields than conventional Nb-Ti or Nb3Sn wires (Figure 1), and as shown in the companion article in this issue by Kato et al. they can also have high Jc at 77 K.Of the three major families of high-temperature superconductors, YBa2Cu3O7-x, Bi-Sr-Ca-Cu-O (BSCCO), and Tl-Ba-Ca-Cu-O, the best wires to date have been made in the BSCCO system. At present, all YBa2Cu3O7-x wires are weak linked and have only small Jc in magnetic fields. In the Tl-based system, the superconducting properties are potentially very interesting, but the toxicity of Tl and the system's complex processing have limited conductor development. For the Bi-based system, the basic processing steps are becoming known, the grains are well connected, and the weak link problem can be controlled. This permits applications in the temperature range 4–77 K, depending on the field and current density requirements of the particular use.

Intrinsic Josephson tunneling for basic studies of high-temperature superconductors

2001 ◽  
Vol 1 (4-5) ◽  
pp. 413-417 ◽  
Author(s):  
A. Yurgens ◽  
V.M. Krasnov ◽  
D. Winkler ◽  
T. Claeson
Keyword(s):  
High Temperature ◽  
High Temperature Superconductors ◽  
Josephson Tunneling ◽  
Basic Studies

scholarly journals Magneto-thermal phenomena in bulk high temperature superconductors subjected to applied AC magnetic fields

2010 ◽  
Vol 23 (7) ◽  
pp. 075006 ◽  
Author(s):  
P Vanderbemden ◽  
P Laurent ◽  
J-F Fagnard ◽  
M Ausloos ◽  
N Hari Babu ◽  
...  
Keyword(s):  
High Temperature ◽  
Magnetic Fields ◽  
High Temperature Superconductors ◽  
Thermal Phenomena

scholarly journals Clear evidence against superconductivity in hydrides under high pressure

2021 ◽  
Author(s):  
Jorge Hirsch ◽  
Frank Marsiglio
Keyword(s):  
Magnetic Field ◽  
High Pressure ◽  
High Temperature ◽  
Magnetic Fields ◽  
Experimental Evidence ◽  
High Temperature Superconductors ◽  
Meissner Effect ◽  
Experimental Results ◽  
Definitive Evidence

Abstract The Meissner effect, magnetic field expulsion, is a hallmark of superconductivity. Associated with it, superconductors exclude applied magnetic fields. Recently Minkov et al. presented experimental results reportedly showing ``definitive evidence of the Meissner effect'' in sulfur hydride and lanthanum hydride under high pressure [1]. Instead, we show here that the evidence presented in that paper does not support the case for superconductivity in these materials. Together with experimental evidence discussed in earlier papers, we argue that this clearly indicates that hydrides under pressure are not high temperature superconductors.

Dynamical Properties of Weakly Coupled Josephson Systems

1990 ◽  
Vol 195 ◽  
Author(s):  
K. H. Lee ◽  
T.-K. Xia ◽  
D. Stroud
Keyword(s):  
High Temperature ◽  
Magnetic Fields ◽  
Harmonic Generation ◽  
Finite Temperature ◽  
Josephson Junctions ◽  
High Temperature Superconductors ◽  
Dynamical Behavior ◽  
Critical Currents ◽  
Weakly Coupled ◽  
Dynamical Properties

ABSTRACTWe review recent work on the dynamical behavior of coupled resistively-shunted Josephson junctions, with emphasis on our own calculations. We present a model which allows for the inclusion of finite temperature, disorder, d.c. and a. c. applied currents, and applied magnetic fields. We discuss applications to (a) calculations of critical currents and IV characteristics; (b) harmonic generation and microwave absorption by finite clusters of Josephson junctions; (c) critical energies for vortex depinning; and (d) quantized voltage plateaus in arrays subjected to combined d.c. and a. c. currents. Possible connections to the behavior of granular high-temperature superconductors are briefly discussed.

Resistive State of High Temperature Superconductors in Magnetic Fields

1990 ◽  
pp. 615-620
Author(s):  
Y. Iye ◽  
S. Nakamura ◽  
T. Tamegai ◽  
T. Terashima ◽  
Y. Bando
Keyword(s):  
High Temperature ◽  
Magnetic Fields ◽  
High Temperature Superconductors ◽  
Resistive State
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