Temperature dependence of the lower critical field and strong pinning in high-temperature superconductors

1991 ◽  
Vol 43 (4) ◽  
pp. 2809-2820 ◽  
Author(s):  
Dragomir Davidović ◽  
Ljiljana Dobrosavljević-Grujić
Keyword(s):  
High Temperature ◽  
Temperature Dependence ◽  
Critical Field ◽  
High Temperature Superconductors ◽  
Lower Critical Field ◽  
Strong Pinning

Temperature Dependence of Positron Annihilation Parameters in High Temperature Superconductors

1992 ◽  
Vol 105-110 ◽  
pp. 477-484 ◽  
Author(s):  
C.S. Sundar ◽  
A. Bharathi ◽  
Yan Ching Jean ◽  
W.Y. Ching ◽  
X. Lu ◽  
...  
Keyword(s):  
High Temperature ◽  
Temperature Dependence ◽  
Positron Annihilation ◽  
High Temperature Superconductors

scholarly journals The Gap and the Upper Critical FieldHc2as Function of Doping for High-TcCuprates

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
S. Orozco ◽  
R. M. Méndez-Moreno ◽  
M. A. Ortiz
Keyword(s):  
High Temperature ◽  
Critical Field ◽  
Energy Gap ◽  
High Temperature Superconductors ◽  
Upper Critical Field ◽  
Superconducting Gap ◽  
Phonon Interaction ◽  
As Doping ◽  
Electron Phonon Interaction ◽  
Wave Symmetry

The relation between thed-wave superconducting gapΔ0and the specific heat obtained with the Volovik effect is used to determine the upper critical fieldHc2as doping function, for high-temperature superconductors. A two-components model withd-wave symmetry, within the BCS framework, is introduced to describe the superconducting state. Generalized Fermi surface topologies are used in order to increase the density of states at the Fermi level, allowing the high-Tcvalues observed. The electron-phonon interaction is considered the most relevant mechanism for the high-Tccuprates, where the available phonon energy is provided by the half-breathing modes. The energy gap valuesΔ0calculated with this model are introduced to describe the variation of the upper critical fieldHc2as function of doping, forLa2-xSrxCuO4.

TEMPERATURE DEPENDENCE OF THE HALL EFFECT IN La2−xSrxCuO4 AND ABa2Cu3O7 (A=Y, Gd) HIGH TEMPERATURE SUPERCONDUCTORS

1987 ◽  
Vol 01 (03n04) ◽  
pp. 1067-1070 ◽  
Author(s):  
M. Petravić ◽  
A. Hamzić ◽  
B. Leontić ◽  
L. Forró
Keyword(s):  
High Temperature ◽  
Temperature Dependence ◽  
Hall Effect ◽  
Normal State ◽  
High Temperature Superconductors ◽  
The Other ◽  
Hall Constant ◽  
High Temperature Superconducting ◽  
Superconducting Ceramics ◽  
Hall Effect Measurements

We present Hall effect measurements in the normal state of the high temperature superconducting ceramics La2−xSrxCuO4 (x=0, 0.1, 0.15, 0.2, 0.25, 0.3), YBa2Cu3o7 and GdBa2Cu3O7 . The first family has temperature independent Hall constant for x>0, while in the other two systems RH is proportional to 1/T. From the Hall effect it follows that the transport in these compounds is hole-like.

Measurement and understanding of the temperature dependence of the lower critical field in YNi2B2C

1996 ◽  
Vol 223-224 ◽  
pp. 86-89 ◽  
Author(s):  
T.V Chandrasekhar Rao ◽  
P.K Mishra ◽  
G Ravikumar ◽  
V.C Sahni ◽  
K Ghosh ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Critical Field ◽  
Lower Critical Field

Nanostructured high-temperature superconductors: Creation of strong-pinning columnar defects in nanorod/superconductor composites

1997 ◽  
Vol 12 (11) ◽  
pp. 2981-2996 ◽  
Author(s):  
Peidong Yang ◽  
Charles M. Lieber
Keyword(s):  
High Temperature ◽  
Critical Current Density ◽  
Defect Structure ◽  
Elevated Temperatures ◽  
High Temperature Superconductors ◽  
Columnar Defect ◽  
Columnar Defects ◽  
The Matrix ◽  
Strong Pinning ◽  
Reference Samples

A chemical approach to the formation of columnar defects involving the growth and incorporation of MgO nanorods into high temperature superconductors (HTS's) has been developed. MgO nanorods were incorporated into Bi2Sr2CaCu2Oz, Bi2Sr2Ca2Cu3Oz, and Tl2Ba2Ca2Cu3Oz superconductors at areal densities up to 2 × 1010/cm2. Microstructural analyses of the composites demonstrate that the MgO nanorods create a columnar defect structure in the HTS matrices, form a compositionally sharp interface with the matrix, and self-organize into orientations perpendicular and parallel to the copper oxide planes. Measurements of the critical current density demonstrate significant enhancements in the MgO nanorod/HTS composites at elevated temperatures and magnetic fields compared with reference samples.

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