Thermoelectric effects in superconductor-ferromagnet tunnel junctions on europium sulfide

Kolenda, S.; Sürgers, Christoph; Fischer, G.; Beckmann, D.

doi:10.1103/physrevb.95.224505

Cited by 61 publications

(75 citation statements)

References 34 publications

(45 reference statements)

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“…Its interface with a ferromagnetic metal results in a spin-polarized conductance leading to a large Seebeck effect. Following this principle, large spin-dependent TE effects have been theoretically proposed [2][3][4][5][6][7][8][9] and experimentally demonstrated [10][11][12] in spin-split and -polarized superconducting tunnel contacts [13]. Furthermore, TE properties in a variety of systems have been investigated [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Spin-flip enhanced thermoelectricity in superconductor-ferromagnet bilayers

et al. 2018

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We study the effects of spin-splitting and spin-flip scattering in a superconductor (S) on the thermoelectric (TE) properties of a tunneling contact to a metallic ferromagnet (F) using the Green's function method. A giant thermopower has been theoretically predicted and experimentally observed in such structures. This is attributed to the spin-dependent particle-hole asymmetry in the tunneling density of states (DOS) in the S/F heterostructure. Here, we evaluate the S DOS and thermopower for a range of temperatures, Zeeman-splitting, and spin-flip scattering. In contrast to the naive expectation based on the negative effect of spin-flip scattering on Cooper pairing, we find that the spin-flip scattering strongly enhances the TE performance of the system in the low-field and lowtemperature regime. This is attributed to a complex interplay between the charge and spin conductances caused by the softening of the spin-dependent superconducting gaps. The maximal value of the thermopower exceeds k B /e by a factor of ≈5 and has a non-monotonic dependence on spin-splitting and spin-flip rate.

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Section: Introductionmentioning

confidence: 99%

Spin-flip enhanced thermoelectricity in superconductor-ferromagnet bilayers

et al. 2018

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“…Further breaking the spin symmetry in transport through a spin filter can then provide large thermoelectric effects as the two spins are weighed differently [243,29,244]. This prediction has been recently confirmed experimentally in [177,245].…”

Section: Thermoelectric Effects In Superconducting Structuresmentioning

confidence: 80%

“…[243] showed how a superconductor with a spin-splitting field, tunnel coupled to a normal metal via a spin-polarized interface, exhibits a thermoelectric effect where the figure of merit can become very large. To our knowledge, only this mechanism has been so far accessed experimentally [177,245]. We explain this mechanism in more detail below.…”

Section: Thermoelectric Effects In Superconductorsmentioning

confidence: 98%

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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“…Superconducting spintronics aims at utilizing the spin degree of freedom of either Cooper pairs or quasiparticles to implement functional electronic devices [1][2][3][4]. Recently, large spin-dependent thermoelectric effects have been predicted [5,6] and observed [7][8][9] in high-field superconductor-ferromagnet tunnel junctions. These thermoelectric effects are predicted to lead to exceptional thermoelectric figures of merit ZT ∼ 40 in optimized structures [10], and can be potentially applied in high-resolution thermometers [11], radiation detectors [12] and coolers [13].…”

Section: Introductionmentioning

confidence: 99%

Nonlocal thermoelectric effects in high-field superconductor-ferromagnet hybrid structures

Heidrich

Beckmann

2019

Phys. Rev. B

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We report on the experimental observation of nonlocal spin-dependent thermoelectric effects in superconductor-ferromagnet multiterminal structures. Our samples consist of a thin superconducting aluminum wire with several ferromagnetic tunnel junctions attached to it. When a thermal excitation is applied to one of the junctions in the presence of a Zeeman splitting of the density of states of the superconductor, a thermoelectric current is observed in remote junctions at distances exceeding 10 µm. The results can be explained by recent theories of coupled spin and heat transport in high-field superconductors.

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Thermoelectric effects in superconductor-ferromagnet tunnel junctions on europium sulfide

Cited by 61 publications

References 34 publications

Spin-flip enhanced thermoelectricity in superconductor-ferromagnet bilayers

Spin-flip enhanced thermoelectricity in superconductor-ferromagnet bilayers

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

Nonlocal thermoelectric effects in high-field superconductor-ferromagnet hybrid structures

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