Dia- and paramagnetic Meissner effect from odd-frequency pairing in multi-orbital superconductors

Abstract

The Meissner effect is one of the defining properties of superconductivity, with a conventional superconductor completely repelling an external magnetic field. In contrast to this diamagnetic behavior, odd-frequency superconducting pairing has often been seen to produce a paramagnetic Meissner effect, which instead makes the superconductor unstable due to the attraction of magnetic field. In this work we study how both even- and odd-frequency superconducting pairing contributes to the Meissner effect in a generic two-orbital superconductor with a tunable odd-frequency pairing component. By dividing the contributions to the Meissner effect into intra- and inter-band processes, we find that the odd-frequency pairing actually generates both dia- and paramagnetic Meissner responses, determined by the normal-state band structure. More specifically, for materials with two electron-like (hole-like) low-energy bands we find that the odd-frequency inter-band contribution is paramagnetic but nearly canceled by a diamagnetic odd-frequency intra-band contribution. Combined with a diamagnetic even-frequency contribution, such superconductors thus always display a large diamagnetic Meissner response to an external magnetic field, even in the presence of large odd-frequency pairing. For materials with an inverted, or topological, band structure, we find the odd-frequency inter-band contribution to instead be diamagnetic and even the dominating contribution to the Meissner effect in the near-metallic regime. Taken together, our results show that odd-frequency pairing in multi-orbital superconductors does not generate a destabilizing paramagnetic Meissner effect and can even generate a diamagnetic response in topological materials.

arXiv comment11 pages, 7 figures

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• Interplay of finite-energy and finite-momentum superconducting pairing
• Controllable odd-frequency Cooper pairs in multi-superconductor Josephson junctions
• Quasiparticle interference as a direct experimental probe of bulk odd-frequency superconducting pairing
• Direct detection of odd-frequency superconductivity via time- and angle-resolved photoelectron fluctuation spectroscopy
• Discontinuous Transition to Superconducting Phase
• $\eta$-pairing on bipartite and non-bipartite lattices
• Equal contribution of even and odd frequency pairing to transport across normal metal-superconductor junctions
• Diamagnetic Meissner response of odd-frequency superconducting pairing from quantum geometry
• Odd-frequency superfluidity from a particle-number-conserving perspective
• Emergence of a condensate with finite-energy Cooper pairing in hybrid exciton/superconductor systems