Superconductivity of itinerant electrons coupled to spin chains
Subir Sachdev, R. Shankar
DOI 10.1103/PhysRevB.38.826 · Physical Review B
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Abstract
A one-dimensional model of itinerant electrons interacting with an antiferromagnetic spin-½ chain is introduced and solved. The model is designed to create ferromagnetic spin polarons around each itinerant electron. The model is mapped onto a sine-Gordon Hamiltonian of three massless Bose fields. A renormalization-group analysis of the bosonic theory shows that the original model possesses quasi-long-range odd-parity superconductivity and spin-density-wave order. The relevance to high-temperature and heavy-fermion superconductors is discussed.
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