Dimer-induced heavy-fermion superconductivity in the Shastry-Sutherland Kondo lattice model
arXiv:1610.01913 · doi:10.1103/PhysRevB.92.165431
Abstract
We study the Kondo lattice model on the geometrically frustrated Shastry-Sutherland lattice focusing on the quantum phase transition between the valence bond solid and the heavy fermion liquid phase. By explicitly including spinon pairing of local moments at the mean-field level, we establish the emergence of a unique heavy fermion superconducting phase induced by dimer ordering of the local moments coexisting with Kondo hybridization. Furthermore, we demonstrate that for suitable choices of parameters, a partial Kondo-screening phase, where some of the valence bonds are broken, precedes the aforementioned dimer-induced superconducting phase. Our results have important implications in understanding the experimental observations in the heavy fermion Shasstry-Sutherland compounds.
arXiv comment8 pages, 7 figures
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- Breakdown of coherence in Kondo alloys: crucial role of concentration vs band filling
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