High temperature superconductor YBa2.15Cu2.85O6.5 in microwave field of the ESR spectrometer — Evidence of granular superconductivity

1988 ◽  
Vol 38 (4) ◽  
pp. 457-460 ◽  
Author(s):  
M. Kohl ◽  
M. Odehnal ◽  
S. šafrata ◽  
K. Vacek
Keyword(s):  
High Temperature ◽  
Microwave Field ◽  
High Temperature Superconductor ◽  
Granular Superconductivity

Microwave cavity made from high temperature superconductor

1988 ◽  
Vol 24 (17) ◽  
pp. 1085 ◽  
Author(s):  
W.J. Radcliffe ◽  
J.C. Gallop ◽  
C.D. Langham ◽  
M. Gee ◽  
M. Stewart
Keyword(s):  
High Temperature ◽  
High Temperature Superconductor ◽  
Microwave Cavity

The activation energy U(T,B) in high temperature superconductor

2020 ◽  
Vol 92 (2) ◽  
pp. 20601
Author(s):  
Abdelaziz Labrag ◽  
Mustapha Bghour ◽  
Ahmed Abou El Hassan ◽  
Habiba El Hamidi ◽  
Ahmed Taoufik ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Activation Energy ◽  
Phase Diagram ◽  
High Temperature ◽  
Apparent Activation Energy ◽  
High Temperature Superconductor ◽  
Flux Flow ◽  
Resistivity Measurements ◽  
Vortex Phase ◽  
The Magnetic Field

It is reported in this paper on the thermally assisted flux flow in epitaxial YBa2Cu3O7-δ deposited by Laser ablation method on the SrTiO3 substrate. The resistivity measurements ρ (T, B) of the sample under various values of the magnetic field up to 14T in directions B∥ab-plane and B∥c-axis with a dc weak transport current density were investigated in order to determine the activation energy and then understand the vortex dynamic phenomena and therefore deduce the vortex phase diagram of this material. The apparent activation energy U0 (B) calculated using an Arrhenius relation. The measured results of the resistivity were then adjusted to the modified thermally assisted flux flow model in order to account for the temperature-field dependence of the activation energy U (T, B). The obtained values from the thermally assisted activation energy, exhibit a behavior similar to the one showed with the Arrhenius model, albeit larger than the apparent activation energy with ∼1.5 order on magnitude for both cases of the magnetic field directions. The vortex glass model was also used to obtain the vortex-glass transition temperature from the linear fitting of [d ln ρ/dT ] −1 plots. In the course of this work thanks to the resistivity measurements the upper critical magnetic field Hc2 (T), the irreversibility line Hirr (T) and the crossover field HCrossOver (T) were located. These three parameters allowed us to establish a phase diagram of the studied material where limits of each vortex phase are sketched in order to optimize its applicability as a practical high temperature superconductor used for diverse purposes.

Nonlocal optical response of a layered high-temperature superconductor slab

2018 ◽  
Vol 44 (12) ◽  
pp. 1272-1279 ◽  
Author(s):  
S. Cortés-López ◽  
F. Pérez-Rodríguez
Keyword(s):  
High Temperature ◽  
High Temperature Superconductor ◽  
Optical Response

Interaction between a ferromagnet and a high-temperature superconductor at the interface in thin-film heterostructures

1997 ◽  
Vol 23 (6) ◽  
pp. 484-485
Author(s):  
C. V. Yakovlev ◽  
L. A. Kalyuzhnaya ◽  
G. A. Nikolaichuk ◽  
T. A. Krylova ◽  
B. M. Lebed’
Keyword(s):  
Thin Film ◽  
High Temperature ◽  
High Temperature Superconductor
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