JOSEPHSON π-STATE DUE TO SPIN-ACTIVE JUNCTION INTERFACE

2007 ◽  
Vol 21 (18n19) ◽  
pp. 3395-3397
Author(s):  
YASUHIRO ASANO ◽  
YUKI SAWA ◽  
YUKIO TANAKA
Keyword(s):  
Recent Experiment ◽  
Josephson Effect ◽  
Cooper Pairs ◽  
Half Metal ◽  
Spin Flip ◽  
Π State

Motivated by a recent experiment [R. S. Keizer, et. al., Nature 439, 825 (2006)], we study the Josephson effect in superconductor/diffusive half metal/superconductor junctions. The Josephson π-state is more stable than the 0-junction when the spin-flip scattering at the junction interface opens the Josephson channel of the odd-frequency Cooper pairs.

Quasiparticle density of states in a half metal in the presence of odd-frequency Cooper pairs

2008 ◽  
Vol 205 (5) ◽  
pp. 1023-1025 ◽  
Author(s):  
Yasuhiro Asano ◽  
Takehito Yokoyama ◽  
Yukio Tanaka ◽  
Alexander A. Golubov
Keyword(s):  
Density Of States ◽  
Cooper Pairs ◽  
Half Metal ◽  
Quasiparticle Density

Josephson effect and a π-state in superfluid 3He

Nature ◽  
10.1038/17244 ◽  
1999 ◽  
Vol 397 (6719) ◽  
pp. 484-485 ◽  
Author(s):  
Olivier Avenel ◽  
Yury Mukharsky ◽  
Eric Varoquaux
Keyword(s):  
Josephson Effect ◽  
Superfluid 3He ◽  
Π State

scholarly journals Josephson effect and a π-state in superfluid 3He

Nature ◽  
10.1038/17251 ◽  
1999 ◽  
Vol 397 (6719) ◽  
pp. 485-485
Author(s):  
S. Backhaus ◽  
R. W. Simmonds ◽  
A. Loshak ◽  
J. C. Davis ◽  
R. E. Packard
Keyword(s):  
Josephson Effect ◽  
Superfluid 3He ◽  
Π State

Percolation Effects in Composites Superconductor – Ferromagnetic Half-Metal

2014 ◽  
Vol 215 ◽  
pp. 100-104
Author(s):  
Victoria V. Kononenko ◽  
V.Yu. Tarenkov ◽  
A.I. Dyachenko ◽  
V.N. Varyukhin
Keyword(s):  
Metallic Nanoparticles ◽  
Cooper Pairs ◽  
Superconducting Transition ◽  
S Wave ◽  
Half Metallic ◽  
Half Metal ◽  
Spin Polarized ◽  
Wave Symmetry ◽  
Free Transition ◽  
Activated Surface

We investigated transport characteristics of composite that consist of the superconductor MgB2 and ferromagnetic half-metallic nanoparticles La0.7Ca0.3MnO3 (LCMO). The experiments were carried out in a wide temperature range with different volume content of the magnetic impurity. It was found that over 25% of the impurity manganite breaches percolation paths of the diboride magnesium. This leads to a considerable broadening of the MgB2 superconducting transition and the formation of the network of contacts through the ferromagnetic inclusions. This result shows the possibility of the spin - activated surface realization on the superconductor - manganite boundary. It's allowing the free transition of Cooper pairs with s wave symmetry of the order parameter in a ferromagnet with 100% spin-polarized carriers.

scholarly journals Magnetization Control and Transfer of Spin-Polarized Cooper Pairs into a Half-Metal Manganite

2017 ◽  
Vol 8 (4) ◽  
Author(s):  
A. Srivastava ◽  
L. A. B. Olde Olthof ◽  
A. Di Bernardo ◽  
S. Komori ◽  
M. Amado ◽  
...  
Keyword(s):  
Cooper Pairs ◽  
Half Metal ◽  
Spin Polarized

3D MULTICELL DESIGNS FOR REGISTERING OF BOSE–EINSTEIN CONDENSATE CLOUDS

2008 ◽  
Vol 22 (25) ◽  
pp. 2469-2479 ◽  
Author(s):  
GUENNADI A. KOUZAEV ◽  
KARL J. SAND
Keyword(s):  
Josephson Effect ◽  
Three Dimensional ◽  
Einstein Condensate ◽  
Bose Einstein Condensate ◽  
Trapping Effect ◽  
Spin Flip ◽  
Cell Structures ◽  
Bose Einstein

In this letter, the results on the development and simulation of new three-dimensional nanotraps for cold dressed atoms are considered. The traps are the multi-cell structures built by crossed non-touching carbon or metallic nanotubes. The trapping effect is tuned by the DC and RF currents to confine the strong- or low-potential seeking atoms far enough from the areas of strong Casimir–Polder and spin-flip forces. It is supposed that the developed and simulated multi-cell structures are pertinent for catching the Bose–Einstein condensates to demonstrate the Josephson effect, and to enable the study of the entanglement of confined clouds in three-dimensional nano-cells.

Reduction in spin flip breaking of cooper pairs

1968 ◽  
Vol 27 (4) ◽  
pp. 224-225 ◽  
Author(s):  
T.W. Mihalisin
Keyword(s):  
Cooper Pairs ◽  
Spin Flip

Anomalous Josephson current through a topological noncoplanar ferromagnetic trilayer

2022 ◽  
Author(s):  
MengYao Li ◽  
Yang Yang ◽  
Jingguo Hu ◽  
TingMin Liu ◽  
Yong Chun Tao
Keyword(s):  
Bound States ◽  
Josephson Effect ◽  
State Transitions ◽  
Exchange Field ◽  
Free Energies ◽  
Zero Energy ◽  
Spin Singlet ◽  
Π State ◽  
Josephson Supercurrent ◽  
Field Strengths

Abstract We present an anomalous Josephson effect in a TI-based Josephson junction with a ferromagnetic insulator (FI) trilayer which has noncoplanar magnetizations. It is shown that there exist equal spin-singlet and -triplet correlations due to the magnetism-tuning chiral Dirac energy band structure combined with the spin precession and selective equal spin Andreev reflection by chiral Majorana modes (CMMs). The consequent anomalous Josephson supercurrent is exhibited, in which a 0-π or similar 0 - π state transition through phase shift is induced only by exchange field strengths of the first FI region, while the ϕ0 supercurrent and the maximum one gradually drop with the increase of exchange field strengths of the second and third FI regions without relative state transitions. The much different features are found by varying the lengths of trilayer. The Andreev bound states without hybridization for the CMM administrate these features, which could be used to probe and confirm the zero energy CMM. In addition, the corresponding free energies are presented and discussed.

scholarly journals EXACT SOLUTION AT INTEGRABLE COUPLING OF A MODEL FOR THE JOSEPHSON EFFECT BETWEEN SMALL METALLIC GRAINS

2002 ◽  
Vol 16 (23) ◽  
pp. 3429-3438 ◽  
Author(s):  
JON LINKS ◽  
HUAN-QIANG ZHOU ◽  
ROSS H. MCKENZIE ◽  
MARK D. GOULD
Keyword(s):  
Josephson Effect ◽  
Form Factors ◽  
Cooper Pairs ◽  
Strongly Coupled ◽  
Conformal Field ◽  
Pair Tunneling ◽  
Scalar Products ◽  
Metallic Grains ◽  
Integrable Coupling ◽  
Small Metallic Grains

A model is introduced for two reduced BCS systems which are coupled through the transfer of Cooper pairs between the systems. The model may thus be used in the analysis of the Josephson effect arising from pair tunneling between two strongly coupled small metallic grains. At a particular coupling strength the model is integrable and explicit results are derived for the energy spectrum, conserved operators, integrals of motion, and wave function scalar products. It is also shown that form factors can be obtained for the calculation of correlation functions. Furthermore, a connection with perturbed conformal field theory is made.

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