Temperature-dependent scaling of pinning force data in Bi-based high-Tc superconductors

2005 ◽  
Vol 44 (3) ◽  
pp. 277-280 ◽  
Author(s):  
M. R. Koblischka ◽  
J. Sosnowski
Keyword(s):  
Pinning Force ◽  
High Tc Superconductors ◽  
Temperature Dependent ◽  
High Tc ◽  
Force Data

scholarly journals Pinning force scaling analysis of Fe-based high-Tc superconductors

2016 ◽  
Vol 30 (32) ◽  
pp. 1630017 ◽  
Author(s):  
Michael R. Koblischka ◽  
Miryala Muralidhar
Keyword(s):  
Promising Result ◽  
Peak Position ◽  
Scaling Behavior ◽  
Scaling Analysis ◽  
Pinning Force ◽  
High Tc Superconductors ◽  
High Tc ◽  
Extensive Collection ◽  
Force Scaling ◽  
Force Data

Pinning force data, [Formula: see text], of a variety of Fe-based high-[Formula: see text] superconductors (11-, 111-, 122- and 1111-type) were analyzed by means of a scaling approach based on own experimental data and an extensive collection of literature data. The literature data were mostly replotted, but also converted from critical current measurements together with data for the irreversibility line when available from the same authors. Using the scaling approaches of Dew-Hughes [J. Appl. Phys. 44, 1360 (1973)] and Kramer [Philos. Mag. 30, 293 (1974)], we determined the scaling behavior and the best fits to the theory. The data of most experiments analyzed show a good scaling behavior at high temperatures when plotting the normalized pinning force [Formula: see text] versus the irreversibility field, [Formula: see text]. The resulting peak positions, [Formula: see text], were found at [Formula: see text] for the 11-type materials, at [Formula: see text] for the 111-type materials, between 0.32 and 0.5 for the 1111-type materials and between 0.25 and 0.71 for the 122-type materials. Compared to the typical results of Bi2Sr2CaCu2O[Formula: see text] [Formula: see text] and YBa2Cu3O[Formula: see text] [Formula: see text], most of the 122 and 1111 samples investigated show peak values higher than 0.4, which is similar to the data obtained on the light-rare earth 123-type HTSC like NdBa2Cu3Oy. This high peak position ensures a good performance of the materials in high applied magnetic fields and is, therefore, a very promising result concerning the possible applications of the Fe-based high-[Formula: see text] superconductors.

Pinning force of twin planes or grain boundaries in high Tc superconductors

Cryogenics ◽  
1989 ◽  
Vol 29 (3) ◽  
pp. 228-231 ◽  
Author(s):  
P.H. Kes ◽  
A. Pruymboom ◽  
J.van den Berg ◽  
J.A. Mydosh
Keyword(s):  
Grain Boundaries ◽  
Pinning Force ◽  
High Tc Superconductors ◽  
High Tc

Enhancing Superconducting Parameters by Array of External Magnetic Dots

2009 ◽  
Vol 1180 ◽  
Author(s):  
Wei Jiang Yeh ◽  
Bo Cheng
Keyword(s):  
Magnetic Field ◽  
Thin Film ◽  
Thin Films ◽  
Pinning Force ◽  
High Tc Superconductors ◽  
High Tc ◽  
Current Value ◽  
Magnetic Dots ◽  
The Magnetic Field ◽  
Superconducting Parameters

AbstractEnhancing the pinning force in high-Tc superconductors can be achieved by externally introduced periodic magnetic dots. We use a novel nano-technique to deposit periodic sub-micon Ni dots on YBa2Cu3O7 thin films. The current versus voltage characteristics of an YBa2Cu3O7 thin film strip with uniform Ni dots are measured at various temperatures and magnetic fields. They are compared with the current versus voltage characteristics of a bare YBa2Cu3O7 thin film strip without magnetic dots. It is found the critical current value of the strip with Ni dots reduces with a much slower pace as the magnetic field strength increases in comparison with the value of the bare sample.

The many faces of STEM in materials science

1991 ◽  
Vol 49 ◽  
pp. 440-441
Author(s):  
John Silcox
Keyword(s):  
Materials Science ◽  
Auger Spectroscopy ◽  
Dark Field ◽  
High Tc Superconductors ◽  
High Tc ◽  
Acoustic Environment ◽  
Electromagnetic Vibration ◽  
The Many ◽  
Serial Mode

Determination of the microstructure and microchemistry of small features often provides the insight needed for the understanding of processes in real materials. In many cases, it is not adequate to use microscopy alone. Microdiffraction and microspectroscopic information such as EELS, X-ray microprobe analysis and Auger spectroscopy can all contribute vital parts of the picture. For a number of reasons, dedicated STEM offers considerable promise as a quantitative instrument. In this paper, we review progress towards effective quantitative use of STEM with illustrations drawn from studies of high Tc superconductors, compound semiconductors and metallization of H-terminated silicon.Intrinsically, STEM is a quantitative instrument. Images are acquired directly by detectors in serial mode which is particularly convenient for digital image acquisition, control and display. The VG HB501A at Cornell has been installed in a particularly stable electromagnetic, vibration and acoustic environment. Care has been paid to achieving UHV conditions (i.e., 10-10 Torr). Finally, it has been interfaced with a VAX 3200 work station by Kirkland. This permits, for example, the acquisition of bright field (or energy loss) images and dark field images simultaneously as quantitative arrays in perfect registration.

Crystal chemistry of high-Tc superconductors

1990 ◽  
Vol 48 (4) ◽  
pp. 1118-1119
Author(s):  
Maryvonne Hervieu
Keyword(s):  
Oxygen Deficiency ◽  
Large Family ◽  
Copper Oxides ◽  
High Tc Superconductors ◽  
High Tc ◽  
Single Mechanism ◽  
Square Planar ◽  
History Of ◽  
Bismuth Cuprates ◽  
New Compounds

Four years after the discovery of superconductivity at high temperature in the Ba-La-Cu-O system, more than thirty new compounds have been synthesized, which can be classified in six series of copper oxides: La2CuO4 - type oxides, bismuth cuprates, YBa2Cu3O7 family, thallium cuprates, lead cuprates and Nd2CuO4 - type oxides. Despite their quite different specific natures, close relationships allow their structures to be simply described through a single mechanism. The fifth first families can indeed be described as intergrowths of multiple oxygen deficient perovskite slabs with multiple rock salt-type slabs, according to the representation [ACuO3-x]m [AO]n.The n and m values are integer in the parent structures, n varying from 0 to 3 and m from 1 to 4; every member of this large family can thus be symbolized by [m,n]. The oxygen deficient character of the perovskite slabs involves the existence or the co-existence of several types of copper environment: octahedral, pyramidal and square planar.Both mechanisms, oxygen deficiency and intergrowth, are well known to give rise easily to nonstoichiometry phenomena. Numerous and various phenomena have actually been characterized in these cuprates, strongly depending on the thermal history of the samples.

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