Magnetic-field-induced crossover from flux-flow to Josephson-junction behavior in a highly transparent weak link

2007 ◽  
Vol 75 (2) ◽  
Author(s):  
T. Horide ◽  
K. Matsumoto ◽  
A. Ichinose ◽  
M. Mukaida ◽  
Y. Yoshida ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Josephson Junction ◽  
Weak Link ◽  
Flux Flow

Magnetic Field Sensor Based on a Single Josephson Junction With a Multilayer Ferromagnet/Normal Metal Barrier

2021 ◽  
Vol 31 (5) ◽  
pp. 1-5
Author(s):  
Ivan P. Nevirkovets ◽  
Mikhail A. Belogolovskii ◽  
Oleg A. Mukhanov ◽  
John B. Ketterson
Keyword(s):  
Magnetic Field ◽  
Josephson Junction ◽  
Normal Metal ◽  
Magnetic Field Sensor ◽  
Field Sensor ◽  
Metal Barrier

Enhanced critical magnetic field for monoatomic-layer superconductor by Josephson junction steps

2021 ◽  
Vol 103 (8) ◽  
Author(s):  
Fumikazu Oguro ◽  
Yudai Sato ◽  
Kanta Asakawa ◽  
Masahiro Haze ◽  
Yukio Hasegawa
Keyword(s):  
Magnetic Field ◽  
Josephson Junction ◽  
Critical Magnetic Field

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.

scholarly journals Dynamics of an annular Josephson junction in a rotating magnetic field

1992 ◽  
Vol 46 (1) ◽  
pp. 294-300 ◽  
Author(s):  
Niels Gro/nbech-Jensen ◽  
Boris A. Malomed ◽  
Mogens R. Samuelsen
Keyword(s):  
Magnetic Field ◽  
Josephson Junction ◽  
Rotating Magnetic Field

MAGNETORESISTANCE IN Bi1.8Pb0.4Sr2Ca2Cu3Oy THICK FILM

1994 ◽  
Vol 08 (26) ◽  
pp. 1661-1665
Author(s):  
WANG ZHIHE ◽  
HAN HANMIN ◽  
HAN GUCHANG ◽  
WANG SHUNXI
Keyword(s):  
Magnetic Field ◽  
Thick Film ◽  
Applied Magnetic Field ◽  
Flow Region ◽  
Irreversibility Line ◽  
Flow Process ◽  
Flux Flow ◽  
Thermally Activated ◽  
Thermally Activated Flux Flow ◽  
Activated Flux

The magnetoresistance curves of Bi(2223) thick film were measured near T c with applied magnetic field parallel and perpendicular to the c axis ranging up to 0.12 T. The results show that thermally activated flux flow region does not exist very close to T c and magnetoresistive transition can be well described by a thermally activated flux flow process below 108.5 K and at lower magnetic field. The relation between applied magnetic field H and temperature T was found to fit with “irreversibility line.”

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