Order from Disorder in the Two-Dimensional Kondo-Necklace

Details Order from Disorder in the Two-Dimensional Kondo-Necklace Order from Disorder in the Two-Dimensional Kondo-Necklace

2006-06-11

arxiv.org/abs/cond-mat/0606269v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 6 figures

Scientific paper

We analyze the effects of site-dilution disorder on the thermodynamic properties of the two-dimensional Kondo necklace using finite-temperature stochastic series expansion. Results will be discussed for the dependence on dilution concentration, temperature, and Kondo exchange-coupling strength of the uniform susceptibility, the staggered structure factor, and the Chakravarty-Halperin-Nelson ratio. Dilution is shown to induce effective free-spin clusters in the gapped phase of the clean system with a low-temperature Curie constant renormalized below 1/4. Furthermore, dilution is demonstrated to generate antiferromagnetic order in the quantum disordered phase of the clean system, i.e. order-from-disorder. In turn, the quantum critical point of the clean system, separating an antiferromagnetic from a paramagnetic dimerized state at a critical Kondo exchange-coupling strength $J_{c}\approx1.4$ is suppressed. Finally, speculations on a renormalized classical behavior in the dilution induced ordered phase are stated.

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