Spin fractionalization in a Kondo-lattice superconductor heterostructure

Ethan Huecker; Yashar Komijani

doi:10.1103/PhysRevB.108.195120

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Spin fractionalization in a Kondo-lattice superconductor heterostructure

Ethan Huecker, Yashar Komijani

DOI 10.1103/PhysRevB.108.195120 · Physical Review B

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Abstract

Kondo lattices are one of the classic models of strongly correlated systems where despite a long history, a full understanding of the excitation spectra is still not available. Here we propose that recent progress in engineering heterostructures can be leveraged to gain insight into and even tune this spectra. We use a strong Kondo coupling expansion to study spin-1 excitations of a Kondo lattice in both one and two dimensions to see whether paramagnons in a Kondo insulator fractionalize into spin-1/2 excitations. We show that while paramagnons are stable in the strong Kondo coupling limit, the presence of sufficient proximity-induced superconducting pairing can favor fractionalization. Our results can be checked using a neutron scattering study of Kondo-lattice heterostructures, and they can pave the way toward engineering strongly correlated electronic systems.

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Formula	Reported Tc (K)	Pressure (GPa)	Type
CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
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