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

Abstract

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 $10\mu \mathrm{m}$. The results can be explained by recent theories of coupled spin and heat transport in high-field superconductors.

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• Spin currents driven by the Higgs mode in magnetic superconductors
• Observation of magnetic state dependent thermoelectricity in superconducting spin valves
• Identifying Bogoliubov Fermi surfaces via thermoelectric response in a $d$-wave superconductor heterostructure
• Nonlocal thermoelectricity in quantum wires as a signature of Bogoliubov-Fermi points
• Complete magnetic control over the superconducting thermoelectric effect
• Bipolar thermoelectrical SQUIPT (BTSQUIPT)
• Phase-dependent charge and heat current in thermally biased short Josephson junctions formed at helical edge states
• Spin-dependent coupling of supercurrent and nonequilibrium quasiparticles in high-field superconductors
• Bipolar thermoelectricity in S/I/NS and S/I/SN superconducting tunnel junctions
• Spontaneous symmetry breaking-induced thermospin effect in superconducting tunnel junctions