Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-04-14
Phys. Rev. B 60, 14609 (1999)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages
Scientific paper
10.1103/PhysRevB.60.14609
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 x_c. When x = x_c the spin gap closes and a ferrimagnetic phase appears. This is the first 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.
Johannesson Henrik
Zvyagin Andrei
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