Upper Critical and Irreversibility Fields in Ba(Fe0.92Co0.08)2As2 and Ba(Fe0.91Co0.09)2As2 Pnictide Bulk Superconductors

2016 ◽  
Vol 30 (3) ◽  
pp. 561-568 ◽  
Author(s):  
Martin Nikolo ◽  
John Singleton ◽  
Dmitry Solenov ◽  
Jianyi Jiang ◽  
Jeremy D. Weiss ◽  
...  
Keyword(s):  
Bulk Superconductors ◽  
Irreversibility Fields

scholarly journals Upper critical and irreversibility fields in Ni- and Co-doped pnictide bulk superconductors

2018 ◽  
Vol 536 ◽  
pp. 833-838 ◽  
Author(s):  
Martin Nikolo ◽  
John Singleton ◽  
Dmitry Solenov ◽  
Jianyi Jiang ◽  
Jeremy Weiss ◽  
...  
Keyword(s):  
Bulk Superconductors ◽  
Irreversibility Fields ◽  
Co Doped

Upper Critical and Irreversibility Fields in Ba(Fe0.95Ni0.05)2As2 and Ba(Fe0.94Ni0.06)2As2 Pnictide Bulk Superconductors

2016 ◽  
Vol 30 (2) ◽  
pp. 331-341 ◽  
Author(s):  
Martin Nikolo ◽  
John Singleton ◽  
Dmitry Solenov ◽  
Jianyi Jiang ◽  
Jeremy D. Weiss ◽  
...  
Keyword(s):  
Bulk Superconductors ◽  
Irreversibility Fields

scholarly journals Upper critical and irreversibility fields in Ni- and Co- doped pnictide bulk superconductors

2017 ◽  
Author(s):  
Martin Nikolo ◽  
John Singleton ◽  
Dmitry Solenov ◽  
Jianyi Jiang ◽  
Jeremy Weiss ◽  
...  
Keyword(s):  
Bulk Superconductors ◽  
Irreversibility Fields ◽  
Co Doped

scholarly journals Spatial Distribution of Flexural Strength in Y–Ba–Cu–O Bulk Superconductors

2018 ◽  
Vol 28 (4) ◽  
pp. 1-5 ◽  
Author(s):  
Kai Yuan Huang ◽  
Difan Zhou ◽  
Jan Srpcic ◽  
Yunhua Shi ◽  
Devendra K. Namburi ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Flexural Strength ◽  
Bulk Superconductors

Field dependence of trapped fields in (Nd, Eu, Gd)-Ba-Cu-O bulk superconductors

2000 ◽  
Vol 13 (6) ◽  
pp. 756-760 ◽  
Author(s):  
M Muralidhar ◽  
T Miyamoto ◽  
M Murakami
Keyword(s):  
Field Dependence ◽  
Bulk Superconductors

Structure and Functional Properties of Bulk MgB2 Superconductors Synthesized and Sintered under Pressure

2014 ◽  
Vol 792 ◽  
pp. 21-26 ◽  
Author(s):  
Tatiana Prikhna ◽  
Michael Eisterer ◽  
Wolfgang Gawalek ◽  
Athanasios G. Mamalis ◽  
Artem Kozyrev ◽  
...  
Keyword(s):  
Critical Current ◽  
Material Structure ◽  
Bulk Materials ◽  
Critical Fields ◽  
Current Densities ◽  
Upper Critical Fields ◽  
Irreversibility Fields ◽  
Grain Boundary Pinning ◽  
Effect Of Oxygen ◽  
Oxygen Impurities

The high pressure (50 MPa - 2 GPa) – high temperature synthesized MgB2 bulk materials are characterized by nearly theoretical density (1-2% porosity), 80-98% connectivity, extremely high critical current densities (e.g. at 20 K, in 0–1 T jc=1.3–1.0 MA·cm-2 (with 10% SiC) and jc= 0.92 – 0.73 MA·cm-2 (without doping)), large irreversibility fields (Birr(18.4 K) =15 T and Birr (0 K) = 32.5 T) and high upper critical fields (Bc2 (22 K) =15 T and Bc2(0 K) ~ 42.1 T). The transformation of grain boundary pinning to point pinning in MgB2-based materials with increasing manufacturing temperature (from 800 to 1050 oC) under pressures from 0.1 to 2 GPa correlates well with an increase in critical current density in low external magnetic fields caused by the redistribution of boron and the oxygen impurities in the material structure. As the manufacturing temperature increases, the discontinuous oxygen enriched layers transform into distinct Mg-B-O inclusions and the size and amount of inclusions of higher magnesium borides MgBX (X>4) are reduced. The effect of oxygen and boron redistribution can be enhanced by Ti or SiC additions.

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