The superconducting spin valve and triplet superconductivity

Superconducting switching due to a triplet component in the Pb/Cu/Ni/Cu/Co2Cr1−xFexAly spin-valve structure

“…3 depicts the dependence of T c on α for the sample PLAK4216. It appears qualitatively similar to the ones observed by us previously ([9,13,15,21,23–26]), reaching a minimum near α = 90°. However, the minimum that we observe now is much deeper, suggesting that the SSV effect is dominated by the spin polarized (triplet) Cooper pairs.…”

“…The necessity to consider arbitrary F/F interface parameters is due to different materials of the two F layers. This is a new theoretical ingredient, in comparison to fittings of our previous experiments in [9,13,21]. Fig.…”

“…This theoretical prediction was experimentally confirmed for the first time by some of us in the study of the Fe1/Cu/Fe2/Pb multilayer [13]. A constantly growing experimental and theoretical interest to the various aspects of the LRTC and its implications for the functionality of SSVs has evolved by now into a new area in the field of SC spintronics [4,8–9].…”

“…Gu et al [7] found in the system CuNi/Nb/CuNi a magnitude of the SSV effect (where and are the SC transition temperatures for the AP and P orientation of the magnetization of the F1 and the F2 layer) of 6 mK and a width of the SC transition curves δ T c ≈ 0.1 K. Unfortunately, the full switching between the normal and SC states could not be achieved because the necessary relation between Δ T c and δ T c , Δ T c > δ T c was by far not fulfilled. Since then much experimental work reviewed in [4,8–9] was done until, in 2010, some of the present authors have demonstrated the full on/off switching between the SC and normal states in a Fe1/Cu/Fe2/In heterostructure, as proposed by Oh et al, with Δ T c = 19 mK and δ T c ≈ 7 mK [10]. That the F1/F2/S structure is indeed beneficial in achieving the full SSV effect was previously indicated by the results in [11], in which possible values of Δ T c ≈ 200 mK in the superlattice [Fe 2 V 11 ] 20 was obtained indirectly.…”

Superconducting switching due to triplet component in the Pb/Cu/Ni/Cu/Co$_2$Cr$_{1-x}$Fe$_x$Al$_y$ spin-valve structure

“…Since then much experimental work reviewed, e.g., in Refs. 4,8,9 , has been done until in 2010 some of the present authors have demonstrated the full on/off switching between the SC and normal states in the Oh's et al type heterostructure Fe1/Cu/Fe2/In with ∆T c = 19 mK and δT c ∼ 7 mK 10 . That the F1/F2/S structure is beneficial in achieving the full SSV was previously indicated by the results in Ref.…”