EXPONENTIAL MODEL FOR LEVITATION FORCE OF YBa2Cu3O7-δ BULKS IN APPLIED FIELDS

2005 ◽  
Vol 19 (01n03) ◽  
pp. 395-397 ◽  
Author(s):  
HONGHAI SONG ◽  
ZHONGYOU REN ◽  
JUN ZHENG ◽  
XINGZHI WANG ◽  
SUYU WANG ◽  
...  
Keyword(s):  
High Temperature ◽  
Critical Current Density ◽  
Current Density ◽  
Applied Field ◽  
Levitation Force ◽  
High Temperature Superconductors ◽  
Exponential Model ◽  
Exponential Relationship ◽  
Bean Model ◽  
Applied Fields

The exponential model is proposed for levitation force calculations of high temperature superconductors in place of Bean model according to the Exponential relationship between the critical current density and applied field. The calculated results are larger than the experimental results in both symmetrical and unsymmetrical applied fields. The normalization curves agree well in the symmetrical applied field, however, they much differ in the unsymmetrical applied field.

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.

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