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arXiv · 1507.02613

Spin glass induced by infinitesimal disorder in geometrically frustrated kagome lattice

M. Schmidt·F. M. Zimmer·S. G. Magalhaes
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Abstract

We propose a method to study the magnetic properties of a disordered Ising kagome lattice. The model considers small spin clusters with infinite-range disordered couplings and short-range ferromagnetic (FE) or antiferromagnetic interactions. The correlated cluster mean-field theory is used to obtain an effective single-cluster problem. A finite disorder intensity in FE kagome lattice introduces a cluster spin-glass (CSG) phase. Nevertheless, an infinitesimal disorder stabilizes the CSG behavior in the geometrically frustrated kagome system. Entropy, magnetic susceptibility and spin-spin correlation are used to describe the interplay between disorder and geometric frustration (GF). We find that GF plays an important role in the low-disorder CSG phase. However, the increase of disorder can rule out the effect of GF.

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M. Schmidt, F. M. Zimmer, S. G. Magalhaes. 2015-07-09. Spin glass induced by infinitesimal disorder in geometrically frustrated kagome lattice. https://doi.org/10.1016/j.physa.2015.07.010

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