Possibility of a π Josephson junction and switch in superconductors with spiral magnetic order

Kulić, Miodrag L.; Kulić, Igor M.

doi:10.1103/physrevb.63.104503

Cited by 42 publications

(42 citation statements)

References 17 publications

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“…This result also agrees with the corresponding one in Ref. 13. Note once more the crucial role played by the voltage in this system.…”

Section: Josephson Effect Between Two Non-uniform Helimagnetic Susupporting

confidence: 93%

“…Previously a similar analysis was undertaken for helimagnetic superconductors with a uniform superconducting order parameter. 13 In the case of vanishing voltage our results reduce essentially to the ones obtained in Ref. 13.…”

supporting

confidence: 78%

“…13 In the case of vanishing voltage our results reduce essentially to the ones obtained in Ref. 13. However, at nonzero voltages the corresponding AC Josephson effect in non-uniform helimagnetic superconductors changes the physics more drastically than in the case of BCS superconductors.…”

supporting

confidence: 64%

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Spin and charge Josephson effects between nonuniform superconductors with coexisting helimagnetic order

2006

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We consider the spin and charge Josephson current between two non-uniform Fulde-Ferrel-LarkinOvchinnikov superconductors with helimagnetic order. We demonstrate that the presence of the helimagnetic phase generates a spin Josephson effect and leads to additional contributions to both single-particle and Josephson charge current. It is shown that for such systems the AC effect differs more radically from the DC effect than in the case of a BCS superconductor with helimagnetic order considered earlier in the literature [M. L. Kulić and I. M. Kulić, Phys. Rev. B 63, 104503 (2001)] where a spin Josephson current has also been found. In our system the most interesting effect occurs in the presence of an external magnetic field and in absence of voltage, where we show that the charge Josephson current can be tuned to zero while the spin Josephson current is nonvanishing. This provides a well controlled mechanism to generate a spin supercurrent in absence of charge currents.

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“…This result also agrees with the corresponding one in Ref. 13. Note once more the crucial role played by the voltage in this system.…”

Section: Josephson Effect Between Two Non-uniform Helimagnetic Susupporting

confidence: 93%

supporting

confidence: 78%

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Spin and charge Josephson effects between nonuniform superconductors with coexisting helimagnetic order

2006

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“…We will show here that, although the current I c indeed depends on θ in a way similar to that in Ref. [16], the dependence of I c on various parameters is completely different. The point is that the tunnel Hamiltonian method is not applicable to inhomogeneous superconductors and, in particular, to MS s with a spiral magnetization.…”

Section: Introductionsupporting

confidence: 69%

Surface effects in magnetic superconductors with a spiral magnetic structure

Volkov

2008

Phys. Rev. B

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We consider a magnetic superconductor (MS ) with a spiral magnetic structure. On the basis of generalized Eilenberger and Usadel equations we show that near the boundary of the MS with an insulator or vacuum the condensate (Gor'kov's) Green's functions are disturbed by boundary conditions and differ essentially from their values in the bulk. Corrections to the bulk quasiclassical Green's functions oscillate with the period of the magnetic spiral, 2π/Q, and decay inside the superconductor over a length of the order v/2πT (ballistic limit) or D/πT (diffusive limit). We calculate the dc Josephson current in an MS/I/MS tunnel junction and show that the critical Josephson current differs substantially from that obtained with the help of the tunnel Hamiltonian method and bulk Green's functions.

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“…This phenomenon is completely due to the triplet pairing since it dominates on this distance. Kulic and Kulic [129] considered two bulk magnetic superconductors with rotating magnetization separated by an insulating layer. They also have found that the sign of the Josephson current can be negative depending on the relative chirality.…”

Section: Triplet Pairingmentioning

confidence: 99%

Ferromagnet–superconductor hybrids

Lyuksyutov¹,

Pokrovsky²

2005

Advances in Physics

328

246

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A new class of phenomena discussed in this review is based on interaction between spatially separated, but closely located ferromagnets and superconductors. They are called Ferromagnet-Superconductor Hybrids (FSH). These systems include coupled smooth and textured Ferromagnetic and Superconducting films, magnetic dots, wires etc. The interaction may be provided by the magnetic flux from magnetic textures and supercurrents. The magnetic flux from magnetic textures or topological defects can pin vortices or create them, changing drastically the properties of the superconductor. On the other hand, the magnetic field from supercurrents (vortices) strongly interacts with the magnetic subsystem leading to formation of coupled magnetic-superconducting topological defects. We discuss possible experimental realization of the FSH. The presence of ferromagnetic layer can change dramatically the properties of the superconducting film due to proximity effect. We discuss experimental and theoretical studies of the proximity effect in the FSH including transition temperature, order parameter oscillations and triplet superconductivity.

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Possibility of a π Josephson junction and switch in superconductors with spiral magnetic order

Cited by 42 publications

References 17 publications

Spin and charge Josephson effects between nonuniform superconductors with coexisting helimagnetic order

Spin and charge Josephson effects between nonuniform superconductors with coexisting helimagnetic order

Surface effects in magnetic superconductors with a spiral magnetic structure

Ferromagnet–superconductor hybrids

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