Temperature dependence of upper critical fields for clean superconductors of the second kind. II

1969 ◽  
Vol 222 (4) ◽  
pp. 358-362 ◽  
Author(s):  
Gerhart Lüders ◽  
Klaus-Dieter Usadel
Keyword(s):  
Temperature Dependence ◽  
Critical Fields ◽  
Upper Critical Fields

Characterization of Inhomogeneities in Amorphous Superconductors

1985 ◽  
Vol 58 ◽  
Author(s):  
Esen E. Alp ◽  
S.K. Malik ◽  
Y. Lepetre ◽  
P.A. Montano ◽  
G.K. Shenoy
Keyword(s):  
Electrical Resistivity ◽  
Electron Diffraction ◽  
Temperature Dependence ◽  
Flux Pinning ◽  
Ac Susceptibility ◽  
Exafs Spectroscopy ◽  
Superconducting Properties ◽  
Critical Fields ◽  
Upper Critical Fields

ABSTRACTThe structure and superconducting properties of rapidly quenched Zr—Ni and Zr—V alloys have been studied by XRD,EXAFS spectroscopy,TEM,electron diffraction,ED, electrical resistivity and ac susceptibility measurements. Amorphous Zr66Ni34 ribbons quenched with different cooling rates were also examined by flux pinning measurements. Characteristic differences are observed in the flux pinning mechanisms of microcrystalline and amorphous samples. The temperature dependence of upper critical fields have been measured down to 0.4 K and the results are analyzed in terms of WHH theory.

A novel technique for synthesizing MgB2thin films with high upper critical fields

2008 ◽  
Vol 21 (8) ◽  
pp. 085009 ◽  
Author(s):  
Y Shen ◽  
R Gandikota ◽  
R K Singh ◽  
F L Hunte ◽  
J Jaroszynski ◽  
...  
Keyword(s):  
Critical Fields ◽  
Novel Technique ◽  
Upper Critical Fields

Anisotropic Upper Critical Fields of Highly Oriented Bi-Sr-Ca-Cu-O Thin Films Prepared by Coevaporation

1988 ◽  
Vol 27 (Part 2, No. 6) ◽  
pp. L1094-L1096 ◽  
Author(s):  
Tsutomu Yoshitake ◽  
Tetsuro Satoh ◽  
Yoshimi Kubo ◽  
Takashi Manako ◽  
Hitoshi Igarashi
Keyword(s):  
Thin Films ◽  
Critical Fields ◽  
Upper Critical Fields

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.

Upper critical fields of single-crystalline and polycrystalline Ca-Sr-Bi-Cu-O compounds

1988 ◽  
Vol 47 (2) ◽  
pp. 209-211 ◽  
Author(s):  
J. N. Li ◽  
K. Kadowaki ◽  
M. J. V. Menken ◽  
Y. K. Huang ◽  
K. Bakker ◽  
...  
Keyword(s):  
Critical Fields ◽  
Single Crystalline ◽  
Upper Critical Fields
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