Josephson effect between conventional and Rashba superconductors

Hayashi, Nobuhiko; Iniotakis, Christian; Machida, Masahiko; Sigrist, Manfred

doi:10.1016/j.physc.2007.11.065

Cited by 12 publications

(10 citation statements)

References 26 publications

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“…Several studies of NCSs within the quasiclassical theory of superconductivity exist in the literature. 13,54,64,70 One often employed simplification is to neglect the spin-orbit coupling splitting of the Fermi surface since the Fermi energy is always much larger than the spin-orbit coupling. It has been pointed out how this simplification gives results qualitatively similar to the ones obtained without it.…”

Section: Model and Formalismmentioning

confidence: 99%

Proximity effect with noncentrosymmetric superconductors

2012

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We describe the superconducting proximity effect taking place in a contact between a noncentrosymmetric superconductor and a diffusive normal/ferromagnetic metal within the quasiclassical theory of superconductivity. By solving numerically the Usadel equation with boundary conditions valid for arbitrary interface transparency, we show that the analysis of the proximity-modified local density of states in the normal side can be used to obtain information about the exotic superconductivity of noncentrosymmetric materials. We point out the signatures of triplet pairing, the coexistence of triplet and singlet pairing, and particular orbital symmetries of the pair potential. Exploiting the directional dependence of the spin polarization pair breaking effect on the triplet correlations, we show how the order relation between triplet and singlet gaps can be discriminated and that an estimation of the specific gap ratio is possible in some cases.Comment: 11 pages, 4 figure

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Section: Model and Formalismmentioning

confidence: 99%

Proximity effect with noncentrosymmetric superconductors

2012

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“…Indeed working Josephson contacts of this kind have been fabricated for CePt 3 Si 14 and isostructural LaPt 3 Si 15 , both coupled to Al. Hayashi et al 16 pointed out that the observed qualitative difference in the interference effect in a magnetic field for Al-CePt 3 Si Josephson contacts could be understood in terms of selection rules for the even and odd parity components of the superconducting pairing state. While the selection rules are concerned with lowest order Josephson tunneling, we would like to extend our discussion including higher order couplings, restricting ourselves, however, to contributions of the Andreev bound states at the two-dimensional interface.…”

Section: Introductionmentioning

confidence: 99%

Josephson effect and triplet-singlet ratio of noncentrosymmetric superconductors

et al. 2014

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We calculate the Andreev bound states and the corresponding Josephson current for an asymmetric 2-dimensional Josephson junction by solving Bogoliubov-de-Gennes equations. The junction consists of a non-centrosymmetric superconductor (NCS) separated by a tunneling barrier with a variable height to a conventional s-wave superconductor. In addition to the antisymmetric spinorbit coupling in the NCS on the one side, this asymmetric junction gives rise to a Rashba spin-orbit coupling at the interface. We explore the rich parameter space and recover various limiting cases such as s-wave/p-wave junction and the asymmetric s-wave junctions. In addition, we report a transition from a 0-junction to a π/2-junction with increasing triplet-singlet pairing ratio of the NCS, which serves as a novel mechanism to determine the unknown ratio in a variety of NCS's.

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“…It should be noted that several proposals have been reported concerning a spontaneous magnetization of CePt 3 Si. 10,11) The Josephson effect of the present junctions is demonstrated in Fig. 3.…”

Section: Resultsmentioning

confidence: 79%

Josephson Effect of Heavy-Fermion Superconductors Measured in a 3-Axes Magnetometer

et al. 2011

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We have fabricated a 3-axes magnetometer that can reduce the residual magnetic field below 50 µG for each direction. Josephson critical current I c between a noncentrosymmetric superconductor (CePt 3 Si or LaPt 3 Si) and Al has been investigated inside it to avoid the magnetic-flux trapping during the superconducting transition and found to show a magnetic field H dependence similar to the previous one obtained using one-axis magnetometer; asymmetric patterns with respect to H = 0 are commonly observed for CePt 3 Si and LaPt 3 Si. This suggests that the residual-field components perpendicular to H applied for I c (H) measurements does not basically affect the I c (H) patterns.

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Josephson effect between conventional and Rashba superconductors

Cited by 12 publications

References 26 publications

Proximity effect with noncentrosymmetric superconductors

Proximity effect with noncentrosymmetric superconductors

Josephson effect and triplet-singlet ratio of noncentrosymmetric superconductors

Josephson Effect of Heavy-Fermion Superconductors Measured in a 3-Axes Magnetometer

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