Analysis of Average Transport Critical Current Density of Oxide Superconductors Deposited on a Silver Base

1996 ◽  
Vol 35 (Part 1, No. 1A) ◽  
pp. 76-81
Author(s):  
Win-Der Lee ◽  
Tzong-Jer Yang ◽  
Bi-Shiou Chiou
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Transport Critical Current Density ◽  
Oxide Superconductors

Superconducting Thallium Oxide and Mercury Oxide Films

2000 ◽  
Vol 659 ◽  
Author(s):  
Raghu N. Bhattacharya ◽  
S. L. Yan ◽  
Zhongwen Xing ◽  
Yiyuan Xie ◽  
Judy Z. Wu ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Optical Imaging ◽  
Critical Current ◽  
Current Density ◽  
Transport Critical Current Density ◽  
Oxide Superconductors ◽  
Zero Field ◽  
Oxide Superconductor ◽  
Mercury Oxide ◽  
Thallium Oxide

ABSTRACTPreviously we reported on a two-layer electrodeposition process of thallium oxide superconductors that showed transport critical current density above 106 A/cm2 at 77 K in zero field. In this article, we report our effort to convert an electrodeposited thick film of (Tl,Bi,Pb)2(Sr,Ba)2Ca1Cu2Ox to (Hg,Bi,Pb)2(Sr,Ba)2Ca1Cu2Ox by the cation-exchange process. We are also reporting magneto-optical imaging data on Tl oxide superconductor films, which are compared with YBCO. Magneto-optical imaging provides insight into the nature of current flow in the Tl oxide superconductor, and thus, will help us to improve the critical current density in bulk high-temperature superconductor wire or tape.

Enhanced transport critical current density in Sn-added SmFeAsO1−xFxtapes prepared by the PIT method

2017 ◽  
Vol 30 (6) ◽  
pp. 065004 ◽  
Author(s):  
Qianjun Zhang ◽  
Xianping Zhang ◽  
Chao Yao ◽  
He Huang ◽  
Dongliang Wang ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Transport Critical Current Density

scholarly journals Possible quantum critical behavior revealed by the critical current density of hole doped high-Tc cuprates in comparison to heavy fermion superconductors

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
S. H. Naqib ◽  
R. S. Islam
Keyword(s):  
Critical Current Density ◽  
Copper Oxide ◽  
Critical Point ◽  
Critical Current ◽  
Current Density ◽  
Heavy Fermion ◽  
Quantum Critical Point ◽  
Oxide Superconductors ◽  
Copper Oxide Superconductors ◽  
Quantum Critical

Abstract The superconducting critical current density, Jc, in hole doped cuprates show strong dependence on the doped hole content, p, within the copper oxide plane(s). The doping dependent Jc mainly exhibits the variation of the intrinsic depairing critical current density as p is varied. Jc(p) tends to peak at p ~ 0.185 in copper oxide superconductors. This particular value of the hole content, often termed as the critical hole concentration, has several features putative to a quantum critical point (QCP). Very recently, the pressure dependences of the superconducting transition temperature (Tc) and the critical current (Ic) in pure CeRhIn5 and Sn doped CeRhIn5 heavy fermion compounds have been reported (Nature Communications (2018) 9:44, 10.1038/s41467-018-02899-5). The critical pressure demarcates an antiferromagnetic quantum critical point where both Tc and Ic are maximized. We have compared and contrasted this behavior with those found for Y1−xCaxBa2Cu3O7−δ in this brief communication. The resemblance of the systematic behavior of the critical current with pressure and hole content between heavy fermion systems and hole doped cuprates is significant. This adds to the circumstantial evidence that quantum critical physics probably plays a notable role behind the unconventional normal and superconducting state properties of copper oxide superconductors.

Degradation of YBC critical current as a result of annealing in air

1993 ◽  
Vol 8 (5) ◽  
pp. 943-944 ◽  
Author(s):  
Judith Bransky
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Standard Method ◽  
Transport Critical Current Density ◽  
Ceramic Ybco

The present study was aimed at determining the rate of degradation of the transport critical current density Jc of ceramic YBCO stored in atmosphere, as a function of temperature. The transport critical current of ring-shaped samples was measured by the inductance technique. The samples were prepared by the standard method. The results show that annealing at 100 °C for over 500 h caused practically no degradation of Jc. Above 100 °C the rate of degradation increases rapidly with temperature.

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