Thermospin effects in superconducting heterostructures

Bobkova, I. V.; Bobkov, A. M.

doi:10.1103/physrevb.96.104515

Cited by 22 publications

(25 citation statements)

References 48 publications

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“…The above discussion on heat engines assumes a structure size much longer than the spin-relaxation length, and hence disregards this spin accumulation. The effect of the thermally induced spin accumulation on the superconducting gap was considered by Bobkova and Bobkov (2017), who predicted the associated changes in the critical temperature.…”

Section: Spin Seebeck Effectmentioning

confidence: 99%

Colloquium : Nonequilibrium effects in superconductors with a spin-splitting field

et al. 2018

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We review the recent progress in understanding the properties of spin-split superconductors under non-equilibrium conditions. Recent experiments and theories demonstrate a rich variety of transport phenomena occurring in devices based on such materials that suggest direct applications in thermoelectricity, low-dissipative spintronics, radiation detection and sensing. We discuss different experimental situations and present a theoretical framework based on quantum kinetic equations. Within this framework we provide an accurate description of the non-equilibrium distribution of charge, spin and energy, which are the relevant non-equilibrium modes, in different hybrid structures. We also review experiments on spin-split superconductors and show how transport measurements reveal the properties of the non-equilibrium modes and their mutual coupling. We discuss in detail spin injection and diffusion and very large thermoelectric effects in spin-split superconductors.

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Section: Spin Seebeck Effectmentioning

confidence: 99%

Colloquium : Nonequilibrium effects in superconductors with a spin-splitting field

et al. 2018

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“…Ref. [288] utilized this fact and predicted that the thermally induced spin accumulation in a spin-split superconductor can result to changes in the critical temperature: besides only suppressing it at low temperatures, it can enhance the critical temperature at some intermediate temperatures, or even lead to a situation where superconductivity shows up only between two critical temperatures.…”

Section: Thermally Induced Spin Currentsmentioning

confidence: 99%

Thermal, electric and spin transport in superconductor/ferromagnetic-insulator structures

Heikkilä

Силаев

Virtanen

et al. 2019

Progress in Surface Science

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A ferromagnetic insulator (FI) attached to a conventional superconductor (S) changes drastically the properties of the latter. Specifically, the exchange field at the FI/S interface leads to a splitting of the superconducting density of states. If S is a superconducting film, thinner than the superconducting coherence length, the modification of the density of states occurs over the whole sample. The coexistence of the exchange splitting and superconducting correlations in S/FI structures leads to striking transport phenomena that are of interest for applications in thermoelectricity, superconducting spintronics and radiation sensors. Here we review the most recent progress in understanding the transport properties of FI/S structures by presenting a complete theoretical framework based on the quasiclassical kinetic equations. We discuss the coupling between the electronic degrees of freedom, charge, spin and energy, under non-equilibrium conditions and its manifestation in thermoelectricity and spin-dependent transport.

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“…The pumped spin current [83] I s ∝ m ×ṁ has a longitudinal component I s h which generates a time-dependent spin accumulation μ s in the SC. In combination with the spin-splitting field h, this results in [51,88]…”

Section: B Spin Torques Generated Be the Higgs Modementioning

confidence: 99%

Spin and charge currents driven by the Higgs mode in high-field superconductors

Силаев

Ojajärvi

Heikkilä

2020

Phys. Rev. Research

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The Higgs mode in superconducting materials describes slowly decaying oscillations of the order parameter amplitude. We demonstrate that in superconductors with a built-in spin-splitting field the Higgs mode is strongly coupled to the spin degrees of freedom, allowing for the generation of time-dependent spin currents. Converting such spin currents to electric signals by spin-filtering elements provides a tool for the second-harmonic generation and the electrical detection of the Higgs mode generated by the external irradiation. The nonadiabatic spin torques generated by these spin currents allow for the magnetic detection of the Higgs mode by measuring the precession of the magnetic moment in the adjacent ferromagnet. We discuss also the reciprocal effect, which is the generation of the Higgs mode by the magnetic precession. Coupling the collective modes in superconductors to light and magnetic dynamics provides an opportunity for the study of superconducting optospintronics.

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Thermospin effects in superconducting heterostructures

Cited by 22 publications

References 48 publications

Colloquium : Nonequilibrium effects in superconductors with a spin-splitting field

Colloquium : Nonequilibrium effects in superconductors with a spin-splitting field

Thermal, electric and spin transport in superconductor/ferromagnetic-insulator structures

Spin and charge currents driven by the Higgs mode in high-field superconductors

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