Superconducting Properties of YBaCuO Bulk Superconductors

2019 ◽  
Vol 14 (12) ◽  
pp. 1755-1758 ◽  
Author(s):  
Sang Heon Lee
Keyword(s):  
High Temperature ◽  
Large Scale ◽  
High Temperature Superconductor ◽  
High Temperature Superconductivity ◽  
Liquid Nitrogen Temperature ◽  
Industrial Applications ◽  
Power Cables ◽  
Ceramic Superconductors ◽  
Bulk Superconductors ◽  
Ybacuo Bulk

The use of a high-temperature superconductor to manufacture products for commercialization requires a superconductor with a flexible function designed to meet the characteristics of each product. Appropriate mechanical properties need to be maintained to overcome the Lorenz force generated under high magnetic fields. Several studies focused on the improvement of superconductivity and the development of processing technology. However, high temperature superconductivity wires are not intended for large-scale applications at liquid nitrogen temperature (77 K). Recently, ceramic superconductors have been fabricated into bulk and thin films or wire rods for electric power applications; however, ceramics are hard to deform due to increased hardness, which is one of the biggest limitations of a superconductor, and a major obstacle to industrial applications. To overcome these limitations, a synthetic method for superconductivity to reduce the hardness of ceramic superconductor and prevent its degradation was proposed for applications such as superconductivity power cables and wires in energy and electric machines using superconductors.

APPLICATIONS IN THE ADVANCED TRANSPORTATION SYSTEM AND IMPACT ON SUPERCONDUCTIVITY INDUSTRY OF HTSM

2005 ◽  
Vol 19 (01n03) ◽  
pp. 427-429
Author(s):  
Y. P. ZHANG ◽  
Y. ZHAO
Keyword(s):  
Information Technology ◽  
High Temperature ◽  
Large Scale ◽  
Theoretical Study ◽  
High Temperature Superconductivity ◽  
Transportation System ◽  
The Other ◽  
Development Potential ◽  
Social Demand ◽  
Transportation Technologies

As the information technology grows up and its application penetrates into every area of this world, how to faster and more efficiently transport people and goods is becoming the new social demand, which indicates a new revolution on advanced transportation technology being brewed. High-temperature Superconductivity Maglev (HTSM) is one with the best development potential among most transportation technologies. It could be used in many advanced transportation fields, overcoming the key contradiction and shortcoming of the current transportation patterns such as train, automobile and airplane. On the other hand, HTSM will promote theoretical study and technology exploitation on superconductivity. HTSM's applications in a large scale will bring up profound effect on the forming and development of the superconductivity industry.

Crystal Growth of High Temperature Superconductors

MRS Bulletin ◽  
1988 ◽  
Vol 13 (10) ◽  
pp. 56-61 ◽  
Author(s):  
H.J. Scheel ◽  
F. Licci
Keyword(s):  
High Temperature ◽  
Critical Current Density ◽  
Single Crystals ◽  
Critical Current ◽  
Current Density ◽  
Large Scale ◽  
High Temperature Superconductivity ◽  
High Temperature Superconductors ◽  
Superconducting Transition ◽  
Theoretical Understanding

The discovery of high temperature superconductivity (HTSC) in oxide compounds has confronted materials scientists with many challenging problems. These include the preparation of ceramic samples with critical current density of about 106 A/cm2 at 77 K and sufficient mechanical strength for large-scale electrotechnical and magnetic applications and the preparation of epitaxial thin films of high structural perfection for electronic devices.The main interest in the growth of single crystals is for the study of physical phenomena, which will help achieve a theoretical understanding of HTSC. Theorists still do not agree on the fundamental mechanisms of HTSC, and there is a need for good data on relatively defect-free materials in order to test the many models. In addition, the study of the role of defects like twins, grain boundaries, and dislocations in single crystals is important for understanding such parameters as the critical current density. The study of HTSC with single crystals is also expected to be helpful for finding optimum materials for the various applications and hopefully achieving higher values of the superconducting transition temperature Tc than the current maximum of about 125 K. It seems unlikely at present that single crystals will be used in commercial devices, but this possibility cannot be ruled out as crystal size and quality improve.

scholarly journals RAMAN SCATTERING IN IRON-BASED SUPERCONDUCTORS

2012 ◽  
Vol 26 (28) ◽  
pp. 1230020 ◽  
Author(s):  
A. M. ZHANG ◽  
Q. M. ZHANG
Keyword(s):  
High Temperature ◽  
Raman Scattering ◽  
Cuprate Superconductors ◽  
High Temperature Superconductivity ◽  
Industrial Applications ◽  
Layered Compounds ◽  
Correlated Electron Systems ◽  
Correlated Electron ◽  
History Of ◽  
Iron Based

Iron-based superconducting layered compounds have the second highest transition temperature after cuprate superconductors. Their discovery is a milestone in the history of high-temperature superconductivity and will have profound implications for high-temperature superconducting mechanism as well as industrial applications. Raman scattering has been extensively applied to correlated electron systems including the new superconductors due to its unique ability to probe multiple primary excitations and their coupling. In this review, we will give a brief summary of the existing Raman experiments in the iron-based materials and their implications for pairing mechanism in particular. And we will also address some open issues from the experiments.

Ultrasonic Shear Velocity Anomalies in Bulk Thallium-1212 High Temperature Superconductor

1997 ◽  
Vol 11 (08) ◽  
pp. 359-365 ◽  
Author(s):  
R. Abd-Shukor
Keyword(s):  
High Temperature ◽  
High Temperature Superconductor ◽  
Thermal Hysteresis ◽  
High Temperature Superconductivity ◽  
High Temperature Superconductors ◽  
Shear Velocity ◽  
Pronounced Change ◽  
Velocity Anomalies ◽  
Ultrasonic Shear

Ultrasonic shear velocity of bulk TlSr2(Ca, Cr)Cu2O7 and (Tl, Bi)Sr2(Ca, Cr)Cu2O7 high temperature superconductors has been measured between 80 K and above 200 K at 8 MHz. A hardening trend was observed in both samples as the temperature was lowered. A large thermal hysteresis was observed in the TlSr2(Ca, Cr)Cu2O7 (density 3.74 g/cm3) but very much suppressed in the (Tl, Bi)Sr2(Ca, Cr)Cu2O7 (density 5.40 g/cm3) sample. Shear velocity hysteresis in these materials is very much determined by the density and microstructure and may not be directly related to high temperature superconductivity. A pronounced change in the shear velocity at about 160–190 K signifying a softening tendency was observed in the (Tl, Bi)Sr2(Ca, Cr)Cu2O7 material. Some possible mechanisms of the origin of these anomalies are discussed.

INFLUENCE OF WAITING TIME ON THE LEVITATION FORCE BETWEEN A PERMANENT MAGNET AND A SUPERCONDUCTOR

2008 ◽  
Vol 22 (07) ◽  
pp. 499-506 ◽  
Author(s):  
XING-YI ZHANG ◽  
YOU-HE ZHOU ◽  
JUN ZHOU
Keyword(s):  
Permanent Magnet ◽  
Liquid Nitrogen ◽  
Waiting Time ◽  
Levitation Force ◽  
Liquid Nitrogen Temperature ◽  
Zero Field ◽  
Bulk Superconductors ◽  
Growth Method ◽  
Ndfeb Permanent Magnet ◽  
Ybacuo Bulk

This paper describes the experimental results of the levitation force of single-grained YBaCuO bulk superconductors preparing by the top-seeded melt-growth method with different waiting time tw below an NdFeB permanent magnet. It was found that waiting time has large effects on the zero-field-cooled (ZFC) and field-cooled (FC) levitation force, and the levitation force shows aging characteristics at the liquid nitrogen temperature.

Artificially Layered Superconductors

MRS Bulletin ◽  
1990 ◽  
Vol 15 (2) ◽  
pp. 29-36 ◽  
Author(s):  
Ivan K. Schuller ◽  
J. Guimpel ◽  
Y. Bruynseraede
Keyword(s):  
High Temperature ◽  
High Temperature Superconductivity ◽  
Critical Currents ◽  
Model Systems ◽  
Critical Fields ◽  
Layered Superconductors ◽  
Ceramic Superconductors ◽  
Recent Developments ◽  
Physical Phenomena ◽  
Preparation Techniques

The study of Artificially Layered Superconductors (ALS) started more than 20 years ago with the search for unusual and/or high temperature superconductivity in a variety of metal-semiconducting layers. Renewed interest was motivated by the advent of novel preparation techniques that allow control of layer thicknesses close to interatomic distances. In this way layered superconductors can be used as model systems to study a variety of physical phenomena, prepare structures with improved properties and discover novel metastable phases which do not exist in nature. Examples of these studies include: a diversity of dimensional transitions, interaction between superconductivity and magnetism, interaction between superconductivity and electron localization, enhancements of critical fields and critical currents, and the study of incommensurate systems.Recent developments in high temperature ceramic superconductors further increase the importance of studies of Artificially Layered Superconductors. The newly discovered ceramic superconductors are structurally layered and therefore many of their properties will also be determined by this structure. Because of this, particularly in the search for the mechanism of superconductivity, it is important to understand which properties are a consequence of the layered nature of the material and which are due to the presence of some unusual, yet undetermined physical phenomena.What makes Artificially Layered Superconductors especially attractive for investigation? The main reason rests on the fact that the characteristic lengths which determine the superconducting properties, i.e., the coherence length and penetration depth, are quite long in conventional low temperature superconductors.

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