Origin of the spin-triplet Andreev reflection at ferromagnet/s-wave superconductor interface

2008 ◽  
Vol 103 (2) ◽  
pp. 023921 ◽  
Author(s):  
Cui Di Feng ◽  
Zhi Ming Zheng ◽  
Yi Qun Ji ◽  
Zhi Ping Niu ◽  
D. Y. Xing
Keyword(s):  
Andreev Reflection ◽  
S Wave ◽  
Spin Triplet

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 Evidence for anisotropic spin-triplet Andreev reflection at the 2D van der Waals ferromagnet/superconductor interface

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Ranran Cai ◽  
Yunyan Yao ◽  
Peng Lv ◽  
Yang Ma ◽  
Wenyu Xing ◽  
...  
Keyword(s):  
Bound States ◽  
Andreev Reflection ◽  
Van Der Waals ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Two Dimensional ◽  
S Wave ◽  
Fundamental Symmetry ◽  
Spin Triplet

AbstractFundamental symmetry breaking and relativistic spin–orbit coupling give rise to fascinating phenomena in quantum materials. Of particular interest are the interfaces between ferromagnets and common s-wave superconductors, where the emergent spin-orbit fields support elusive spin-triplet superconductivity, crucial for superconducting spintronics and topologically-protected Majorana bound states. Here, we report the observation of large magnetoresistances at the interface between a quasi-two-dimensional van der Waals ferromagnet Fe0.29TaS2 and a conventional s-wave superconductor NbN, which provides the possible experimental evidence for the spin-triplet Andreev reflection and induced spin-triplet superconductivity at ferromagnet/superconductor interface arising from Rashba spin-orbit coupling. The temperature, voltage, and interfacial barrier dependences of the magnetoresistance further support the induced spin-triplet superconductivity and spin-triplet Andreev reflection. This discovery, together with the impressive advances in two-dimensional van der Waals ferromagnets, opens an important opportunity to design and probe superconducting interfaces with exotic properties.

Spin-Triplet Andreev Reflection in Ferromagnet/Ferromangnet/ s -Wave Superconductor Junctions

2008 ◽  
Vol 25 (2) ◽  
pp. 691-693 ◽  
Author(s):  
Ji Yi-Qun ◽  
Niu Zhi-Ping ◽  
Feng Cui-Di ◽  
Xing Ding-Yu
Keyword(s):  
Andreev Reflection ◽  
S Wave ◽  
Spin Triplet

Manipulatable Andreev reflection due to the interplay between the DIII-class topological and s -wave superconductors

2018 ◽  
Vol 101 ◽  
pp. 278-283 ◽  
Author(s):  
Xiao-Qi Wang ◽  
Guang-Yu Yi ◽  
Yu Han ◽  
Cui Jiang ◽  
Wei-Jiang Gong
Keyword(s):  
Andreev Reflection ◽  
S Wave

Pseudogap and Unconventional Pairing in the Hubbard Model

1998 ◽  
Vol 12 (29n31) ◽  
pp. 2939-2945 ◽  
Author(s):  
Y. M. Malozovsky ◽  
J. D. Fan
Keyword(s):  
Hubbard Model ◽  
P Wave ◽  
Perturbation Approach ◽  
S Wave ◽  
Orbital State ◽  
Adequate Model ◽  
Hubbard Models ◽  
Spin Singlet ◽  
Spin Triplet ◽  
Spin Response

The attractive (U < 0) and repulsive (U > 0) Hubbard models have been studied using the Fermi liquid perturbation approach. The attractive Hubbard model (U < 0) is an adequate model for 3 He , an incompressible and strongly paramagnetic liquid [Formula: see text], [Formula: see text] for |U|N F = 0.9) with a pseudogap in the charge response. A pairing instability and superfluidity for U < 0 exists in the spin channel only: spin-triplet with l = 0, or spin-singlet with l = 1 (p-wave orbital state j = s + l = 1), where l is the orbital momentum of a pair. The repulsive Hubbard model (U > 0) represents a highly compressible and nearly antiferromagnetic liquid [Formula: see text], [Formula: see text] for UN F = 0.9) with a pseudogap in the spin response. However, for U > 0 a pairing instability and superconductivity exist in the charge channel only: spin-singlet with l = 0 (s-wave), or with l = 2 (d-wave) in the case of an anisotropic Fermi surface.

scholarly journals Spin-Triplet Superconductivity inSr2RuO4Probed by Andreev Reflection

2000 ◽  
Vol 84 (7) ◽  
pp. 1595-1598 ◽  
Author(s):  
F. Laube ◽  
G. Goll ◽  
H. v. Löhneysen ◽  
M. Fogelström ◽  
F. Lichtenberg
Keyword(s):  
Andreev Reflection ◽  
Spin Triplet
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