Spin caloritronics as a probe of nonunitary superconductors

Abstract

Superconducting spintronics explores the interplay between superconductivity and magnetism, sparking significant interest in nonunitary superconductors as a platform for novel magneto-superconducting phenomena. However, identifying nonunitary superconductors remains challenging. We demonstrate that spin current driven by thermal gradients sensitively probes the nature of the condensate in nonunitary superconductors. Spin polarization of the condensate in momentum space induces the superconducting spin Seebeck effect, where a spin current is generated along thermal gradients without a thermoelectric charge current. Notably, the nonvanishing superconducting spin Seebeck effect provides a smoking gun evidence of nonunitary superconductivity because it reflects the spin polarization of the condensate in momentum space, irrespective of whether the net pair spin magnetization vanishes. At the same time, the spin-chirality of the condensate induces the spin-Nernst effect, where a spin current is generated perpendicular to thermal gradients in nonunitary superconductors. These spin caloritronics phenomena offer a definitive probe of nonunitary superconductors.

16 pages, 9 figures

References in corpus (51)

• Topological insulators and superconductors
• Spin Caloritronics
• Topological superconductors: a review
• Superconducting Spintronics
• Spontaneously polarized half-gapped superconductivity
• Spin-polarized supercurrents for spintronics: a review of current progress
• Microscopic evidence for a chiral superconducting order parameter in the heavy fermion superconductor UTe2
• Majorana Fermions and Topology in Superconductors
• Chiral Superconductors
• Chiral P-Wave Order in Sr_2RuO_4
• Electronic thermal conductivity and the Wiedemann-Franz law for unconventional superconductors
• Observation of broken time-reversal symmetry in the heavy fermion superconductor UPt${}_3$
• Symmetry-imposed shape of linear response tensors
• Review of U-based Ferromagnetic Superconductors: Comparison between UGe2, URhGe, and UCoGe
• Evolution of the spin Hall effect in Pt nanowires: Size and temperature effects
• Distribution functions in non-equilibrium theory of superconductivity and Andreev spectroscopy in unconventional superconductors
• Evidence for Time-Reversal-Symmetry-Broken Superconductivity in Locally Noncentrosymmetric SrPtAs
• Observation of the spin Nernst effect
• Models for Superfluid ${}^3$He in Aerogel
• Unconventional Superconductivity in UTe2
• Field-reentrant superconductivity close to a metamagnetic transition in the heavy-fermion superconductor UTe${}_2$
• The Spin Nernst effect in Tungsten
• Superconductivity induced by longitudinal ferromagnetic fluctuations in UCoGe
• Insulator-metal transition and topological superconductivity in UTe2 from a first-principles calculation
• Recent progress on superconductors with time-reversal symmetry breaking
• Quantum Thermal Hall Effect in a Time-Reversal-Symmetry-Broken Topological Superconductor in Two Dimensions : Approach From Bulk Calculations
• Nematic superconductivity in doped Bi2Se3 topological superconductors
• Periodic Anderson model for magnetism and superconductivity in UTe2
• Superconducting states in ferromagnetic metals
• Microscopic Coexistence of Ferromagnetism and Superconductivity in Single-Crystal UCoGe
• Chiral superconductivity in UTe2 probed by anisotropic low-energy excitations
• Colossal thermomagnetic response in the exotic superconductor URu2Si2
• Unconventional superconductors under rotating magnetic field II: thermal transport
• Observation of Spin Nernst effect in Platinum
• Impurity Effects of Aerogel in Superfluid ${}^3$He
• Resolving thermoelectric paradox in superconductors
• Evidence for chiral d-wave superconductivity in URu2Si2 from the field-angle variation of its specific heat
• Quasiparticle Excitations and Evidence for Superconducting Double Transitions in Monocrystalline U0.97Th0.03Be13
• Field-induced compensation of magnetic exchange as the possible origin of reentrant superconductivity in UTe${}_2$
• Topology and symmetry of surface Majorana arcs in cyclic superconductors
• Chiral Higgs Mode in Nematic Superconductors
• Giant Nernst and Hall Effects in Chiral Superconductors due to Berry Phase Fluctuations
• Spin triplet nematic pairing symmetry and superconducting double transition in U${}_{1-x}$Th${}_x$Be${}_{13}$
• Pairing symmetries of multiple superconducting phases in UTe2: Competition between ferromagnetic and antiferromagnetic fluctuations
• Possibility of chiral $d$-wave state in the hexagonal pnictide superconductor SrPtAs
• Low Temperature Thermal Hall Conductivity of a Nodal Chiral Superconductor
• Spin-Nernst Effect in Time-Reversal-Invariant Topological Superconductors
• Theory of Self-Induced Vortex State in Ferromagnetic Superconductors
• Microscopic theory of spin Nernst effect
• Anomalous acoustoelectric effect induced by clapping modes in chiral superconductors
• Impurity bands, line-nodes, and anomalous thermal Hall effect in Weyl superconductors

Cited by in corpus (3)

• Spin Seebeck effect in two-sublattice ferrimagnets in the vicinity of $T_{\mathrm{C}}$
• Intrinsic spin Nernst effect in topological Dirac and magnetic Weyl semimetals
• Intrinsic Nernst Effect from Berry Curvature in Superconductors