Dimer-induced heavy-fermion superconductivity in the Shastry-Sutherland Kondo lattice model

Article

关键词: SPIN SYSTEM SRCU2(BO3)(2);    QUANTUM CRITICALITY;    GROUND-STATE;    ANTIFERROMAGNET;    SYMMETRY;    LIQUIDS;    DIAGRAM;   

DOI  :  10.1103/PhysRevB.92.165431

来源: SCIE

【 摘 要 】

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 for understanding the experimental observations in the heavy fermion Shastry-Sutherland compounds.

【 授权许可】

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