Superconductivity and antiferromagnetism: Hybridization impurities in a two-band spin-gapped electron system

A. A. Zvyagin; H. Johannesson

doi:10.1103/PhysRevB.60.14609

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Superconductivity and antiferromagnetism: Hybridization impurities in a two-band spin-gapped electron system

A. A. Zvyagin, H. Johannesson

DOI 10.1103/PhysRevB.60.14609 · Physical Review B

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Abstract

We present the exact solution of a one-dimensional model of a spin-gapped correlated electron system with hybridization impurities exhibiting both magnetic and mixed-valence properties. The host supports superconducting fluctuations with a spin gap. The localized electrons create a band of antiferromagnetic spin excitations inside the gap for concentrations x of the impurities below some critical value xc. When x=xc, the spin gap closes and a ferrimagnetic phase appears. This is an example of an exactly solvable model with coexisting superconducting and antiferromagnetic fluctuations, which in addition supports a quantum phase transition to a (compensated) ferrimagnetic phase. We discuss the possible relevance of our results for experimental systems, in particular the U-based heavy fermion materials.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
U1-xThxBe13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown