scholarly journals Penetration depth and flux-flow resistivity measurements of BaFe2(As0.55P0.45)2 single crystals

2014 ◽  
Vol 504 ◽  
pp. 24-27 ◽  
Author(s):  
T. Okada ◽  
Y. Imai ◽  
H. Takahashi ◽  
M. Nakajima ◽  
A. Iyo ◽  
...  
Keyword(s):  
Single Crystals ◽  
Penetration Depth ◽  
Flux Flow ◽  
Resistivity Measurements ◽  
Flow Resistivity

Magnetic penetration depth and flux-flow resistivity measurements on NaFe0.97Co0.03As single crystals

2013 ◽  
Vol 494 ◽  
pp. 109-112 ◽  
Author(s):  
T. Okada ◽  
H. Takahashi ◽  
Y. Imai ◽  
K. Kitagawa ◽  
K. Matsubayashi ◽  
...  
Keyword(s):  
Single Crystals ◽  
Penetration Depth ◽  
Magnetic Penetration Depth ◽  
Flux Flow ◽  
Resistivity Measurements ◽  
Flow Resistivity ◽  
Magnetic Penetration

Gap Structure Seen in Magnetic Penetration Depth and Flux-Flow Resistivity of 122 Fe-Based Superconductors

2015 ◽  
Vol 4 (4) ◽  
pp. 308-313
Author(s):  
A. Maeda ◽  
T. Okada ◽  
H. Takahashi ◽  
F. Nabeshima ◽  
Y. Imai ◽  
...  
Keyword(s):  
Penetration Depth ◽  
Magnetic Penetration Depth ◽  
Flux Flow ◽  
Flow Resistivity ◽  
Magnetic Penetration ◽  
Gap Structure

scholarly journals Investigation of the superconducting gap structure in SrFe2(As0.7P0.3)2by magnetic penetration depth and flux flow resistivity analysis

2012 ◽  
Vol 86 (14) ◽  
Author(s):  
Hideyuki Takahashi ◽  
Tatsunori Okada ◽  
Yoshinori Imai ◽  
Kentaro Kitagawa ◽  
Kazuyuki Matsubayashi ◽  
...  
Keyword(s):  
Penetration Depth ◽  
Superconducting Gap ◽  
Magnetic Penetration Depth ◽  
Flux Flow ◽  
Flow Resistivity ◽  
Magnetic Penetration ◽  
Gap Structure

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 The surface impedance of superconductors and normal metals at high frequencies III. The relation between impedance and superconducting penetration depth

1947 ◽  
Vol 191 (1026) ◽  
pp. 399-415 ◽  
Keyword(s):  
Magnetic Field ◽  
Penetration Depth ◽  
Surface Impedance ◽  
Simple Extension ◽  
High Frequencies ◽  
Resistivity Measurements ◽  
Direct Measurements ◽  
Normal Metals ◽  
Velocity Of Propagation ◽  
Theory Of Superconductivity

The theory developed in II is extended to cover the case of a superconductor, and a formula is derived relating the r. f. resistivity to the superconducting penetration depth and other parameters of the metal. It is shown how the penetration depth may be deduced directly from measurements of the skin reactance, and a method of measuring reactance is described, based essentially on the variation of the velocity of propagation along a transmission line due to the reactance of the conductors. For technical reasons it is not convenient to measure the reactance absolutely, but a simple extension of the technique described in I enables the change in reactance to be accurately measured when superconductivity is destroyed by a magnetic field. The method has been applied to mercury and tin. In the former case the results are in agreement with Shoenberg’s direct measurements, and confirm that the penetration depth at 0° K is of the order of 7 x 10 –6 cm. The theory developed at the beginning of the paper is used to deduce the variation of penetration depth with temperature from the resistivity measurements of I, and it is shown that agreement with other determinations and with the reactance measurements is fairly good, but not perfect. Some of the assumptions used in developing the theory are critically discussed, and a qualitative account is given to show how Heisenberg’s theory of superconductivity offers an explanation of some of the salient features of superconductivity and inparticular indicates the relation between superconducting and normal electrons.

The effects of sulfuric acid on the creep, recrystallization, and electrical properties of ice

2003 ◽  
Vol 81 (1-2) ◽  
pp. 395-400 ◽  
Author(s):  
D Iliescu ◽  
I Baker ◽  
X Li
Keyword(s):  
Electrical Resistivity ◽  
Sulfuric Acid ◽  
Single Crystals ◽  
Equal Channel Angular Extrusion ◽  
Boundary Migration ◽  
Constant Load ◽  
Tensile Creep ◽  
Grain Boundary Migration ◽  
Resistivity Measurements ◽  
Lower Resistivity

Both constant load creep and recrystallization are investigated using single crystals of 70–170 ppb sulfuric-acid-doped and -undoped ice. Both sets of crystals exhibited strains in excess of 200% under tensile creep. The undoped specimens reached these strains roughly twice as fast as the doped specimens. After large local strains were imparted to cuboidal single crystals using equal channel angular extrusion at –2°C and subsequent annealing at the same temperature, recrystallization occurred. It was found that a higher concentration of H2SO4 retarded both recrystallization and the subsequent grain-boundary migration. Direct current electrical resistivity measurements performed on polycrystalline, sulfuric-acid-doped (3 ppm) ice at –10°C showed a much lower resistivity in the grain boundaries than in the lattice. PACS No.: 81.90

scholarly journals Flux flow resistivity in the system with two superconducting gaps

2005 ◽  
Vol 359-361 ◽  
pp. 533-535 ◽  
Author(s):  
Jun Goryo ◽  
Hiroshi Matsukawa
Keyword(s):  
Flux Flow ◽  
Flow Resistivity
Sign in / Sign up

Export Citation Format

Share Document