Anisotropies in the magnetic penetration depth and critical current density of R/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-x/ (R=Y or Ho), measured on magnetically-aligned powder composites

1989 ◽  
Vol 25 (2) ◽  
pp. 2324-2327 ◽  
Author(s):  
D.K. Christen ◽  
Y.C. Kim ◽  
S.T. Sekula ◽  
J.R. Thompson ◽  
J. Brynestad ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Penetration Depth ◽  
Critical Current ◽  
Current Density ◽  
Magnetic Penetration Depth ◽  
Powder Composites ◽  
Magnetic Penetration ◽  
Magnetically Aligned

Magnetic Penetration Depth and Intragrain Critical Current Density in Grain-Aligned Tl2Ca2Ba2Cu3O10 Superconductor

1989 ◽  
Vol 169 ◽  
Author(s):  
J. R. Thompson ◽  
D. K. Christen ◽  
H.A. Deeds ◽  
Y. C. Kim ◽  
J. Brynestad ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Critical Current Density ◽  
Penetration Depth ◽  
Critical Current ◽  
Current Density ◽  
High Temperature Superconductor ◽  
Magnetic Penetration Depth ◽  
Magnetic Studies ◽  
Magnetic Penetration ◽  
The Magnetic Field

AbstractMagnetic studies were performed on the high temperature superconductor Tl2Ca2Ba2Cu3O10 (Tc = 123 K) in the form of a grain aligned composite. Investigations with the magnetic field applied parallel and perpendicular to the sample's cannon c-axes were analyzed to obtain the magnetic penetration depth as a function of temperature and the critical current density Jc(H,T).

Correlations between critical current density and penetration depth in ion irradiated YBa/sub 2/Cu/sub 3/O/sub 7/ thin films

1997 ◽  
Vol 7 (2) ◽  
pp. 2005-2008 ◽  
Author(s):  
S.H. Moffat ◽  
R.A. Hughes ◽  
G.D. Poulin ◽  
J.S. Preston ◽  
D.N. Basov ◽  
...  
Keyword(s):  
Thin Films ◽  
Critical Current Density ◽  
Penetration Depth ◽  
Critical Current ◽  
Current Density

JOSEPHSON EFFECTS IN A Y1Ba2Cu3O7 BREAK JUNCTION AT 77 K

1989 ◽  
Vol 03 (03) ◽  
pp. 229-234 ◽  
Author(s):  
S.P. ZHAO ◽  
H.J. TAO ◽  
Y.F. CHEN ◽  
G.C. CHE ◽  
Q.S. YANG
Keyword(s):  
Diffraction Pattern ◽  
Penetration Depth ◽  
Critical Current ◽  
Break Junction ◽  
Nonstationary Processes ◽  
Josephson Effects ◽  
Magnetic Penetration Depth ◽  
Fraunhofer Diffraction ◽  
Shapiro Steps ◽  
Magnetic Penetration

Josephson effects in a Y 1 Ba 2 Cu 3 O 7 break junction at 77 K are reported. The I-V characteristics show clear Shapiro steps under microwave radiation and magnetic dependence of the critical current is of the typical Fraunhofer diffraction pattern. Estimate of the magnetic penetration depth is given. Discussions of the I-V curve concerning nonstationary processes are presented.

Magnetic penetration depth and critical current in YBaCuO thin films

1993 ◽  
Vol 3 (1) ◽  
pp. 2961-2964 ◽  
Author(s):  
T. Kisu ◽  
T. Iinuma ◽  
K. Enpuku ◽  
K. Yoshida ◽  
K. Yamafuji ◽  
...  
Keyword(s):  
Thin Films ◽  
Penetration Depth ◽  
Critical Current ◽  
Magnetic Penetration Depth ◽  
Magnetic Penetration

Aligned Sintered Compacts of RBa2Cu3O7−x (R=Dy, Er, Eu, Gd, Ho, Y)

1987 ◽  
Vol 99 ◽  
Author(s):  
R. H. Arendt ◽  
A. R. Gaddipati ◽  
M. F. Garbauskas ◽  
E. L. Hall ◽  
H. R. Hart ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Single Crystal ◽  
Critical Current ◽  
Current Density ◽  
Critical State ◽  
Magnetic Measurements ◽  
Magnetic Hysteresis ◽  
X Ray ◽  
Significant Alignment ◽  
Magnetically Aligned

ABSTRACTSintered compacts of magnetically aligned single-crystal particles have been studied by x-ray, microscopy, and magnetic measurements. Though significant alignment and very anisotropie magnetic hysteresis were obtained, the magnitude of the hysteresis indicates, through the critical state model, that the bulk critical current density remains low.

Microstructural characterization of YBa2Cu3O7-x thin films formed by metalorganic CVD

1991 ◽  
Vol 49 ◽  
pp. 1080-1081
Author(s):  
P. Lu ◽  
W. Huang ◽  
C.S. Chern ◽  
Y.Q. Li ◽  
J. Zhao ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Film Growth ◽  
Chemical Vapor ◽  
Microstructural Characterization ◽  
Ion Milling ◽  
Conventional Grinding

The YBa2Cu3O7-x thin films formed by metalorganic chemical vapor deposition(MOCVD) have been reported to have excellent superconducting properties including a sharp zero resistance transition temperature (Tc) of 89 K and a high critical current density of 2.3x106 A/cm2 or higher. The origin of the high critical current in the thin film compared to bulk materials is attributed to its structural properties such as orientation, grain boundaries and defects on the scale of the coherent length. In this report, we present microstructural aspects of the thin films deposited on the (100) LaAlO3 substrate, which process the highest critical current density.Details of the thin film growth process have been reported elsewhere. The thin films were examined in both planar and cross-section view by electron microscopy. TEM sample preparation was carried out using conventional grinding, dimpling and ion milling techniques. Special care was taken to avoid exposure of the thin films to water during the preparation processes.

Facet Topography and Dislocation Structure as a Possible Source for Electrical Heterogeneity in [001] TILT Bicrystals of YBa2Cu3O7-δ

1996 ◽  
Vol 54 ◽  
pp. 338-339
Author(s):  
I-Fei Tsu ◽  
D.L. Kaiser ◽  
S.E. Babcock
Keyword(s):  
Grain Boundary ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Electromagnetic Properties ◽  
Length Scale ◽  
Density Values ◽  
Current Densities ◽  
Applied Fields ◽  
A Current

A current theme in the study of the critical current density behavior of YBa2Cu3O7-δ (YBCO) grain boundaries is that their electromagnetic properties are heterogeneous on various length scales ranging from 10s of microns to ˜ 1 Å. Recently, combined electromagnetic and TEM studies on four flux-grown bicrystals have demonstrated a direct correlation between the length scale of the boundaries’ saw-tooth facet configurations and the apparent length scale of the electrical heterogeneity. In that work, enhanced critical current densities are observed at applied fields where the facet period is commensurate with the spacing of the Abrikosov flux vortices which must be pinned if higher critical current density values are recorded. To understand the microstructural origin of the flux pinning, the grain boundary topography and grain boundary dislocation (GBD) network structure of [001] tilt YBCO bicrystals were studied by TEM and HRTEM.

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