Magnon-mediated superconductivity at the interface between a ferromagnetic insulator and a topological crystalline insulator with wallpaper fermions

Koki Mizuno; Ai Yamakage

doi:10.1103/sknv-r7wq

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Magnon-mediated superconductivity at the interface between a ferromagnetic insulator and a topological crystalline insulator with wallpaper fermions

Koki Mizuno, Ai Yamakage

DOI 10.1103/sknv-r7wq · Physical Review B

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Abstract

We study two-dimensional superconductivity mediated by magnetic fluctuations at the interface between a ferromagnetic insulator and the nonsymmorphic topological crystalline insulator with a fourfold-degenerate Dirac point wallpaper fermion. We demonstrate that BCS pairing with zero center-of-mass momentum induces chiral p-wave superconductivity, and the Amperean pairing with center-of-mass momentum 2kF can give rise to a parity-mixed superconducting state. We find that the Amperean pairing exhibits a mixture of s-wave and p-wave components due to the multiband nature of the wallpaper fermion and the easy-axis anisotropy of the ferromagnetic insulator. Additionally, we find that the stability of the superconducting state with BCS and the Amperean pairing is governed by the easy-axis anisotropy.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La3Ni2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown