Defect-induced spin-glass magnetism in incommensurate spin-gap magnets

Abstract

We study magnetic order induced by non-magnetic impurities in quantum paramagnets with incommensurate host spin correlations. In contrast to the well-studied commensurate case where the defect-induced magnetism is spatially disordered but non-frustrated, the present problem combines strong disorder with frustration and, consequently, leads to spin-glass order. We discuss the crossover from strong randomness in the dilute limit to more conventional glass behavior at larger doping, and numerically characterize the robust short-range order inherent to the spin-glass phase. We relate our findings to magnetic order in both BiCu2PO6 and YBa2Cu3O6.6 induced by Zn substitution.

6 pages, 5 figs, (v2) real-space RG results added; discussion extended, (v3) final version as published

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• Diluting a triangular-lattice spin liquid: Synthesis and characterization of NaYb${}_{1-x}$Lu${}_x$S${}_2$ single crystals
• Magnetic responses of randomly depleted spin ladders
• Impact of strong disorder on the static magnetic properties of the spin-chain compound BaCu2SiGeO7
• Spin-Spin Correlation Enhanced by Impurities in a Frustrated Two-leg Spin Ladder