2 research outputs found
Generation of spin-triplet Cooper pairs via a canted antiferromagnet
Spinful triplet Cooper pairs can be generated from their singlet counterparts
available in a conventional superconductor (S) using two or more noncollinear
magnetic moments, typically contributed by different magnets in a multilayered
heterostructure. Here, we theoretically demonstrate that an S interfaced with a
canted antiferromagnet (AF) harbors spinful triplet Cooper pairs capitalizing
on the intrinsic noncollinearity between the two AF sublattice magnetizations.
As the AF canting can be controlled by an applied field, our work proposes a
simple bilayer structure that admits controllable generation of spin-triplet
Cooper pairs. Employing the Bogoliubov-de Gennes framework, we delineate the
spatial dependence of the spin-triplet correlations. We further evaluate the
superconducting critical temperature as a function of the AF canting, which
provides one experimental observable associated with the emergence of these
triplet correlations.Comment: 24 pages, 7 figure
Complete suppression and N\'eel triplets-mediated exchange in antiferromagnet-superconductor-antiferromagnet trilayers
An antiferromagnetic insulator (AFI) bearing a compensated interface to an
adjacent conventional superconductor (S) has recently been predicted to
generate N\'eel triplet Cooper pairs, whose amplitude alternates sign in space.
Here, we theoretically demonstrate that such N\'eel triplets enable control of
the superconducting critical temperature in an S layer via the angle between
the N\'eel vectors of two enclosing AFI layers. This angle dependence changes
sign with the number of S monolayers providing a distinct signature of the
N\'eel triplets. Furthermore, we show that the latter mediate a similarly
distinct exchange interaction between the two AFIs' N\'eel vectors.Comment: 7 pages, 4 figure