Thermoelectricity carried by proximity-induced odd-frequency pairing in ferromagnet/superconductor junctions

Abstract

We explore the role of proximity-induced odd-frequency pairing in the thermoelectricity of a ferromagnet when coupled to a conventional $s$-wave spin-singlet superconductor through a spin-active interface. By varying both the polarization and its direction in the ferromagnet and the interfacial spin-orbit interaction strength, we analyze the behavior of all proximity-induced pair amplitudes in the ferromagnet and their contributions to the thermoelectric coefficients. Based on our results for the Seebeck coefficient, we predict that odd-frequency spin-triplet Cooper pairs are much efficient than the conventional spin-singlet even-frequency pairs in enhancing thermoelectricity of the junction, especially mixed-spin triplet pairing is favorable. Our results on the thermoelectric figure of merit show that ferromagnet/superconductor junctions are very good thermoelectric systems when superconductivity is dominated by odd-frequency pairing.

Published version

References in corpus (8)

• A spin triplet supercurrent through the half-metallic ferromagnet CrO2
• Odd-frequency pairing in normal metal/superconductor junctions
• Signature of magnetic-dependent gapless odd frequency states at superconductor/ferromagnet interfaces
• Manifestation of the odd-frequency spin-triplet pairing state in diffusive ferromagnet / superconductor junctions
• Pairing symmetry conversion by spin-active interfaces in superconducting junctions
• Theory of a large thermoeffect in superconductors doped with magnetic impurities
• Finite bulk Josephson currents and chirality blockade removal from inter-orbital pairing in magnetic Weyl semimetals
• Quantum transport in a normal metal/odd-frequency superconductor junction

Cited by in corpus (6)

• Superconductivity in spin-$3/2$ systems: symmetry classification, odd-frequency pairs, and Bogoliubov Fermi surfaces
• Identifying Bogoliubov Fermi surfaces via thermoelectric response in a $d$-wave superconductor heterostructure
• Quasiparticles-mediated thermal diode effect in Weyl Josephson junctions
• Complete magnetic control over the superconducting thermoelectric effect
• Phase-dependent charge and heat current in thermally biased short Josephson junctions formed at helical edge states
• Yu-Shiba-Rusinov bound states boost odd-frequency superconductivity