Enhancement of superconductivity mediated by antiferromagnetic squeezed magnons

Eirik Erlandsen; Akashdeep Kamra; Arne Brataas; Asle Sudbø

doi:10.1103/PhysRevB.100.100503

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Enhancement of superconductivity mediated by antiferromagnetic squeezed magnons

Eirik Erlandsen, Akashdeep Kamra, Arne Brataas, Asle Sudbø

DOI 10.1103/PhysRevB.100.100503 · Physical Review B

T1

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Abstract

We theoretically investigate magnon-mediated superconductivity in a heterostructure consisting of a normal metal and a two-sublattice antiferromagnetic insulator. The attractive electron-electron pairing interaction is caused by an interfacial exchange coupling with magnons residing in the antiferromagnet, resulting in p-wave, spin-triplet superconductivity in the normal metal. Our main finding is that one may significantly enhance the superconducting critical temperature by coupling the normal metal to only one of the two antiferromagnetic sublattices employing, for example, an uncompensated interface. Employing realistic material parameters, the critical temperature increases from vanishingly small values to significantly larger values than 1 K as the interfacial coupling becomes strongly sublattice asymmetric. We provide a general physical picture of this enhancement mechanism based on the notion of squeezed bosonic eigenmodes.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
NM/AFMI Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1	Pressure not reported	onset