scholarly journals Equal-spin Andreev reflection and long-range coherent transport in high-temperature superconductor/half-metallic ferromagnet junctions

2012 ◽  
Vol 8 (7) ◽  
pp. 539-543 ◽  
Author(s):  
C. Visani ◽  
Z. Sefrioui ◽  
J. Tornos ◽  
C. Leon ◽  
J. Briatico ◽  
...  
Keyword(s):  
High Temperature ◽  
Long Range ◽  
High Temperature Superconductor ◽  
Andreev Reflection ◽  
Half Metallic ◽  
Coherent Transport ◽  
Metallic Ferromagnet

Extremely long-range, high-temperature Josephson coupling across a half-metallic ferromagnet

2021 ◽  
Author(s):  
D. Sanchez-Manzano ◽  
S. Mesoraca ◽  
F. A. Cuellar ◽  
M. Cabero ◽  
V. Rouco ◽  
...  
Keyword(s):  
High Temperature ◽  
Long Range ◽  
Josephson Coupling ◽  
Half Metallic ◽  
Metallic Ferromagnet

Magnetic Coupling in La0.7Ca0.3MnO3/YBa2Cu3O7/La0.7Ca0.3MnO3 Trilayers

2009 ◽  
Vol 289-292 ◽  
pp. 303-309
Author(s):  
N.M. Nemes ◽  
C. Visani ◽  
J. Garcia-Barriocanal ◽  
F.Y. Bruno ◽  
Z. Sefrioui ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Carrier Density ◽  
High Temperature Superconductor ◽  
Hysteresis Loops ◽  
Magnetic Coupling ◽  
Oxygen Depletion ◽  
Free Carrier ◽  
Half Metallic ◽  
Free Carrier Density

We report on the interplay between ferromagnetism and superconductivity in trilayers La0.7Ca0.3MnO3/YBa2Cu3O7/La0.7Ca0.3MnO3 made of half metallic manganite and high temperature superconductor cuprate. Samples with a fully oxygenated cuprate show a magnetic field interval where the magnetizations of the manganite are aligned antiparallel. A considerable magnetoresistance accompanies the switching between magnetization configurations (parallel vs. antiparallel) of the manganite moments. Suppression of the free carrier density of the cuprate which occurs upon oxygen depletion, results in deep modifications in the shape of the normal state hysteresis loops indicating that there may be a magnetic coupling mediated by free carrier density of the cuprate. This result outlines the importance of quasiparticle transmission in the interplay between ferromagnetism and superconductivity in this kind of samples.

scholarly journals FIRST-PRINCIPLES CALCULATIONS OF SPIN-TRIPLET ANDREEV REFLECTION SPECTRA AT HALF-METALLIC FERROMAGNET/SUPERCONDUCTOR INTERFACE

2012 ◽  
Vol 26 (31) ◽  
pp. 1250205 ◽  
Author(s):  
LING TANG
Keyword(s):  
First Principles ◽  
Andreev Reflection ◽  
Magnetic Moments ◽  
S Wave ◽  
Interfacial Roughness ◽  
Zero Bias ◽  
Half Metallic ◽  
Magnetic Disorder ◽  
Spin Triplet ◽  
Metallic Ferromagnet

Combining the first-principles noncollinear calculations of scattering matrices with Andreev approximation, we investigated the spin-triplet Andreev reflection (AR) spectra for the interface between half-metallic ferromagnet Co 2 MnSi and s-wave BCS superconductor Al with and without interfacial roughness, where the orientations of magnetic moments near the interface are randomly distributed. The calculated results show that the AR spectra have peak structures near zero bias for the clean interface with relative weak magnetic disorder. With the increasing degree of interfacial roughness or magnetic disorder, these subgap peaks of conductance spectra will be washed out. The results also show that the value of subgap conductance spectrum can be raised significantly by the magnetic disorder. Finally, our calculations reveal that the long-range spin-triplet AR in Co 2 MnSi / Al (001) interface can be enhanced by a small amount of interfacial roughness.

scholarly journals Coupling of superconductors through a half-metallic ferromagnet: Evidence for a long-range proximity effect

2004 ◽  
Vol 69 (22) ◽  
Author(s):  
V. Peña ◽  
Z. Sefrioui ◽  
D. Arias ◽  
C. Leon ◽  
J. Santamaria ◽  
...  
Keyword(s):  
Long Range ◽  
Proximity Effect ◽  
Half Metallic ◽  
Metallic Ferromagnet

Long-Range Pairing of Bismuth Atoms and the Modulations in Bi2Sr2CaCu2O8+x High-Temperature Superconductor

1998 ◽  
Vol 165 (2) ◽  
pp. 467-482
Author(s):  
D. Kunstelj ◽  
D. Babić ◽  
D. Bagović ◽  
B. Leontić ◽  
Z. Vučić ◽  
...  
Keyword(s):  
High Temperature ◽  
Long Range ◽  
High Temperature Superconductor

Microwave cavity made from high temperature superconductor

1988 ◽  
Vol 24 (17) ◽  
pp. 1085 ◽  
Author(s):  
W.J. Radcliffe ◽  
J.C. Gallop ◽  
C.D. Langham ◽  
M. Gee ◽  
M. Stewart
Keyword(s):  
High Temperature ◽  
High Temperature Superconductor ◽  
Microwave Cavity
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