Evidence for Triplet Superconductivity in a Superconductor-Ferromagnet Spin Valve

Leksin, P. V.; Garif’yanov, N. N.; Гарифуллин, И. А.; Fominov, Ya. V.; Schumann, J.; Krupskaya, Yulia; Kataev, V.; Schmidt, Oliver G.; Büchner, B.

doi:10.1103/physrevlett.109.057005

Cited by 193 publications

(182 citation statements)

References 22 publications

(26 reference statements)

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“…As follows from the theory proposed by Fominov et al [9], the presence of a minimum of the superconducting transition temperature T c in e-mail: kamandi@mail.ru the vicinity of the orthogonal configuration of the magnetizations clearly indicates the generation of the longrange triplet component. We have experimentally confirmed the existence of the long-range triplet component for the CoO x /Fe1/Cu/Fe2/Pb superconducting spin-valve structure [10]. The observed angular dependence of the superconducting transition temperature T c is caused by a combination of the singlet and triplet components of the superconducting condensate.…”

Section: Introductionsupporting

confidence: 56%

“…(1)). The solid lines are the theoretical curves calculated according to the theory proposed by Fominov and his colleagues (see [10]). The lower panels show the angular dependences of the quantity ∆T c trip , i.e., the difference between the actual value of the temperature T c and the reference curve for the corresponding samples.…”

Section: Resultsmentioning

confidence: 99%

“…1 that, when the relative orientation of the magnetizations changes from the parallel (P) (α = 0 o ) to antiparallel (AP) (α = 180 o ) orientation, the superconducting transition temperature T c varies monotonically, passing through the minimum for the noncollinear orientation. According to the theory (see [10]), the characteristic minimum in the dependence T c (α), which is most pronounced in the vicinity of the angle α = 90 o , clearly indicates the generation of the long-range triplet component in the superconducting condensate. By assuming that there is no triplet component (even though, according to the theory, the appearance of such a component is inevitable), it can be expected that the dependence T c (α) will be monotonic.…”

Section: Discussion Of Experimental Resultsmentioning

confidence: 99%

“…In all previous studies of our group (see [10,[17][18][19][20]), the experimental data on the critical temperature T c were compared with the parameter of the theory W, which determines the degree of suppression of superconductivity by the ferromagnetic layer (see [7]). The effective boundary condition for the real component of the anomalous Green's function can be written as…”

Section: Discussion Of Experimental Resultsmentioning

confidence: 99%

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Isolation of proximity-induced triplet pairing channel in a superconductor/ferromagnet spin valve

et al. 2018

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Abstract. In the present work we have studied the proximity-induced superconducting triplet pairing in CoO x /Py1/Cu/Py2/Cu/Pb spin-valve structure (where Py = Ni 0.81 Fe 0.19 ).For CoO x (3 nm)/Py(3 nm)/Cu(4 nm)/Py(0.6 nm)/Cu(2 nm)/Pb(70 nm) we have studied the dependence of the T c on the angle α between the direction of the cooling field and the external field both applied in the plane of the sample. We obtained that the T c does not change monotonically with the angle but passes through a minimum. To observe an "isolated" triplet spin-valve effect we exploited the oscillatory feature of the magnitude of the ordinary spin-valve effect ∆T c in the dependence of the Py2-layer thickness d Py2 . We determined the value of d Py2 at which ∆T c caused by the ordinary spin-valve effect is suppressed. This means that the difference in the T c between the antiparallel and parallel mutual orientation of magnetizations of the Py1 and Py2 layers is zero. For such a sample a "pure" triplet spin-valve effect which causes the minimum in T c at the orthogonal configuration of magnetizations has been observed.

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Section: Introductionsupporting

confidence: 56%

Section: Resultsmentioning

confidence: 99%

Section: Discussion Of Experimental Resultsmentioning

confidence: 99%

Section: Discussion Of Experimental Resultsmentioning

confidence: 99%

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Isolation of proximity-induced triplet pairing channel in a superconductor/ferromagnet spin valve

et al. 2018

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“…This leads to the oscillations of the superconducting transition temperature (T c ) as a function of ferromagnet thickness [7][8][9][10][11] and π phase shift in S/F junctions. 12,13 Furthermore, recent measurements in S/F structures 11,[14][15][16] have provided evidence for triplet pairing in the ferromagnet induced by noncollinear magnetizations of the F layers.…”

Section: Introductionmentioning

confidence: 99%

Vortex flipping in superconductor/ferromagnet spin-valve structures

et al. 2013

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We report in-plane magnetization measurements on Ni/Nb/Ni/CoO and Co/Nb/Co/CoO spin valve structures with one of the ferromagnetic layers pinned by an antiferromagnetic layer. In samples with Ni below the superconducting transition T c , our results show strong evidence of vortex flipping driven by ferromagnet magnetization. This is a direct consequence of the proximity effect that leads to vortex supercurrent leakage into the ferromagnets. Here, the polarized electron spins are subject to the vortices' magnetic field, occasioning vortex flipping. Such a novel mechanism has been made possible by fabrication of the ferromagnet/superconductor/ferromagnet/antiferromagnet multilayered spin valves with an S layer thin enough to barely confine vortices inside as well as F layers thin enough to align and control magnetization within the plane. When Co is used, the vortex flipping effect is not observed. This is attributed to the shorter coherence length of Co. Interestingly, a reduction in the pinning field of about 400 Oe is observed instead when the Nb layer is in the superconducting state. This effect cannot be explained in terms of vortex fields. In view of these facts, any explanation must be directly related to the proximity effect and thus a remarkable phenomenon that deserves further investigation.

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