scholarly journals Triplet pair correlations and nonmonotonic supercurrent decay with Cr thickness in Nb/Cr/Fe/Nb Josephson devices

2014 ◽  
Vol 89 (10) ◽  
Author(s):  
J. W. A. Robinson ◽  
N. Banerjee ◽  
M. G. Blamire
Keyword(s):  
Pair Correlations ◽  
Josephson Devices ◽  
Triplet Pair

scholarly journals Spin-triplet supercurrents in Josephson junctions containing strong ferromagnetic materials

2018 ◽  
Vol 376 (2125) ◽  
pp. 20150150 ◽  
Author(s):  
Norman O. Birge
Keyword(s):  
Proximity Effect ◽  
Josephson Junctions ◽  
Bound States ◽  
Ferromagnetic Material ◽  
Ferromagnetic Materials ◽  
Normal Metal ◽  
Pair Correlations ◽  
Spin Singlet ◽  
Triplet Pair ◽  
Spin Triplet

The proximity effect between a superconducting material and a non-superconducting normal metal can extend over distances of the order of micrometres at sufficiently low temperatures. If the normal metal is replaced by a ferromagnetic material, the spatial extent of the proximity effect drops precipitously due to the exchange splitting between the majority and minority spin bands in the ferromagnet. In 2001, several theorists predicted that spin-triplet pair correlations could be induced in proximity systems involving multiple ferromagnetic materials (or multiple domains in one material) with non-collinear magnetizations. Such spin-triplet pair correlations should extend deep into the ferromagnet, producing a long-range proximity effect. In this paper, we review our experimental work in this area, which has focused primarily on Josephson junctions containing strong ferromagnetic materials. We show that Josephson junctions containing particular combinations of strong ferromagnetic materials can carry spin-triplet supercurrent over distances of at least several tens of nanometres, whereas spin-singlet supercurrent in similar samples decays over a length scale of about 1 nm. We also mention important work by other groups; however, this article is not intended to be a review of the whole field. This article is part of the theme issue ‘Andreev bound states’.

Density dependence of fixed-node errors in diffusion quantum Monte Carlo: Triplet pair correlations

2014 ◽  
Vol 591 ◽  
pp. 170-174 ◽  
Author(s):  
Adem H. Kulahlioglu ◽  
Kevin Rasch ◽  
Shuming Hu ◽  
Lubos Mitas
Keyword(s):  
Monte Carlo ◽  
Density Dependence ◽  
Quantum Monte Carlo ◽  
Pair Correlations ◽  
Triplet Pair ◽  
Fixed Node

scholarly journals np-Pair Correlations in the Isovector Pairing Model

Symmetry ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1405
Author(s):  
Feng Pan ◽  
Yingwen He ◽  
Lianrong Dai ◽  
Chong Qi ◽  
Jerry P. Draayer
Keyword(s):  
Binding Energy ◽  
Occupation Number ◽  
Mean Field ◽  
Energy Difference ◽  
Binding Energies ◽  
Pair Correlations ◽  
Isospin Symmetry Breaking ◽  
Pairing Model ◽  
Proton Pairing ◽  
Spin Basis

A diagonalization scheme for the shell model mean-field plus isovector pairing Hamiltonian in the O(5) tensor product basis of the quasi-spin SUΛ(2) ⊗ SUI(2) chain is proposed. The advantage of the diagonalization scheme lies in the fact that not only can the isospin-conserved, charge-independent isovector pairing interaction be analyzed, but also the isospin symmetry breaking cases. More importantly, the number operator of the np-pairs can be realized in this neutron and proton quasi-spin basis, with which the np-pair occupation number and its fluctuation at the J = 0+ ground state of the model can be evaluated. As examples of the application, binding energies and low-lying J = 0+ excited states of the even–even and odd–odd N∼Z ds-shell nuclei are fit in the model with the charge-independent approximation, from which the neutron–proton pairing contribution to the binding energy in the ds-shell nuclei is estimated. It is observed that the decrease in the double binding-energy difference for the odd–odd nuclei is mainly due to the symmetry energy and Wigner energy contribution to the binding energy that alter the pairing staggering patten. The np-pair amplitudes in the np-pair stripping or picking-up process of these N = Z nuclei are also calculated.

Pair correlations and interaction energies in FePd single crystal

2004 ◽  
Vol 41 (2) ◽  
pp. 207-212 ◽  
Author(s):  
T. Mehaddene ◽  
J. M. Sanchez ◽  
R. Caudron ◽  
M. Zemirli ◽  
V. Pierron-Bohnes
Keyword(s):  
Single Crystal ◽  
Interaction Energies ◽  
Pair Correlations
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