Emergence of d±ip-wave superconducting state at the edge of d-wave superconductors mediated by ferromagnetic fluctuations driven by Andreev bound states

Shun Matsubara; Hiroshi Kontani

doi:10.1103/PhysRevB.101.235103

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Emergence of d±ip-wave superconducting state at the edge of d-wave superconductors mediated by ferromagnetic fluctuations driven by Andreev bound states

Shun Matsubara, Hiroshi Kontani

DOI 10.1103/PhysRevB.101.235103 · Physical Review B

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Abstract

We propose a mechanism of spin-triplet superconductivity at the edge of d-wave superconductors. Recent theoretical research on d-wave superconductors predicted that strong ferromagnetic (FM) fluctuations are induced by a high density of states due to edge Andreev bound states (ABSs). Here, we construct a linearized gap equation for the edge-induced superconductivity and perform a numerical study based on a large cluster Hubbard model with a bulk d-wave superconducting (SC) gap. We find that ABS-induced strong FM fluctuations mediate the d±ip-wave SC state, in which the time-reversal symmetry is broken. The edge-induced p-wave transition temperature Tcp is slightly lower than the bulk d-wave one Tcd, and a Majorana bound state may be created at the end point of the edge.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown