Theory of Half-Metal/Superconductor Heterostructures

M. Eschrig; J. Kopu; J. C. Cuevas; Gerd Schön

doi:10.1103/PhysRevLett.90.137003

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Theory of Half-Metal/Superconductor Heterostructures

M. Eschrig, J. Kopu, J. C. Cuevas, Gerd Schön

DOI 10.1103/PhysRevLett.90.137003 · Physical Review Letters

T1

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Abstract

We investigate the Josephson coupling between two singlet superconductors separated by a half-metallic magnet. The mechanism behind the coupling is provided by the rotation of the quasiparticle spin in the superconductor during reflection events at the interface with the half metal. Spin rotation induces triplet correlations in the superconductor which, in the presence of surface spin-flip scattering, results in an indirect Josephson effect between the superconductors. We present a theory appropriate for studying this phenomenon and calculate physical properties for a superconductor/half-metal/superconductor heterostructure.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La0.7Sr0.3MnO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
CrO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown