scholarly journals Effect of columnar disorder on the superconducting transition of a type-II superconductor in zero applied magnetic field

2004 ◽  
Vol 70 (5) ◽  
Author(s):  
Anders Vestergren ◽  
Mats Wallin ◽  
S. Teitel ◽  
Hans Weber
Keyword(s):  
Magnetic Field ◽  
Applied Magnetic Field ◽  
Type Ii ◽  
Superconducting Transition ◽  
Type Ii Superconductor

scholarly journals Unprecedented high irreversibility line in the nontoxic cuprate superconductor (Cu,C)Ba2Ca3Cu4O11+δ

2018 ◽  
Vol 4 (9) ◽  
pp. eaau0192 ◽  
Author(s):  
Yue Zhang ◽  
Wenhao Liu ◽  
Xiyu Zhu ◽  
Haonan Zhao ◽  
Zheng Hu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Liquid Nitrogen ◽  
Liquid Nitrogen Temperature ◽  
Cuprate Superconductor ◽  
Irreversibility Line ◽  
Type Ii ◽  
Superconducting Transition ◽  
Key Factors ◽  
Field Versus ◽  
Type Ii Superconductor

One of the key factors that limit the high-power applications for a type II superconductor is the irreversibility line Hirr(T), which reflects the very boundary of resistive dissipation in the phase diagram of magnetic field versus temperature. In cuprate family, the Y-, Bi-, Hg-, and Tl-based systems have superconducting transition temperatures exceeding the liquid nitrogen boiling temperature (~77 K). However, the toxic elements Hg and Tl in the latter two systems strongly constrain the applications. The best perspective so far is relying on the YBa2Cu3O7−δ (Tc ≈ 90 K) system, which is nontoxic and has a relatively high irreversibility magnetic field. We report the study of a nontoxic superconductor (Cu,C)Ba2Ca3Cu4O11+δ with Tc = 116 K. We found that the irreversibility magnetic field is extremely high, and it thus provides great potential for applications above the liquid nitrogen temperature.

Calculations of the equilibrium configurations of flux lines in thin films of type II superconductors

1969 ◽  
Vol 47 (14) ◽  
pp. 1447-1460 ◽  
Author(s):  
C. Carter
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Applied Magnetic Field ◽  
Type Ii ◽  
Gibbs Function ◽  
Type Ii Superconductors ◽  
Flux Lines ◽  
Type Ii Superconductor ◽  
Equilibrium Configurations ◽  
London Theory

The London theory is used to calculate the equilibrium configurations of flux lines in thin films of a type II superconductor as a function of the applied magnetic field. Three possible geometrical configurations, of increasing complexity, are considered in detail, and the Gibbs function is minimized with respect to the parameters which define the configuration. The range of applied magnetic field for which each configuration is stable is determined, and hence B–H curves are constructed. A transition from one configuration to another causes a discontinuity in the B–H curve at values of H which roughly correspond to those found experimentally by Sutton.

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