Odd triplet pairing effects induced by interface spin-flip scatterings: critical temperature of superconductor/ferromagnet bilayers
| dc.creator | Doh, Hyeonjin | |
| dc.creator | Choi, Han-Yong | |
| dc.date | 2004-07-07 | |
| dc.date.accessioned | 2026-07-25T15:37:54Z | |
| dc.description | The superconducting critical temperature $T_C$ of a superconductor/ferromagnet (S/F) bilayer with spin-flip scatterings at the interface is calculated as a function of the ferromagnet thickness $d_F$ in the dirty limit employing the Usadel equation. The appropriate boundary conditions from the spin-flip scatterings at the S/F interface are derived for the Usadel equation which includes the spin triplet pairing components as well as the spin singlet one. The spin-flip processes induce the spin triplet pairing components with s-wave in momentum and odd symmetry in frequency from the s-wave singlet order parameter $Δ$ of the superconductor region. The induced triplet components alter the singlet order parameter in the superconductor through boundary conditions at the interface and, consequently, change the $T_C$ of an S/F bilayer system. The calculated $T_C(d_F)$, like the case of no spin-flips, shows non-monotonic behavior which typically decreases as $d_F$ is increased from 0 and shows a shallow minimum and then saturates slowly as $d_F$ is further increased. It is well established that as the interface resistance (parameterized in terms of $γ_b$) is increased, the $T_C$ is increased for a given $d_F$ and the non-monotonic feature in $T_C(d_F)$ is strongly suppressed. As the spin flip scattering (parameterized in terms of $γ_m$) is increased, on the other hand, the $T_C$ is also increased for a given $d_F$, but the non-monotonic feature in $T_C(d_F)$ is less suppressed or even enhanced, through the formation of the spin triplet components. | |
| dc.description | 14 pages, 8 figures, revtex4, submitted to PRB | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0407149 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0407149 | |
| dc.identifier.uri | https://dspace.dare.co.zw/handle/123456789/35564 | |
| dc.subject | Superconductivity | |
| dc.subject | Mesoscale and Nanoscale Physics | |
| dc.title | Odd triplet pairing effects induced by interface spin-flip scatterings: critical temperature of superconductor/ferromagnet bilayers | |
| dc.type | text |