Heterogeneous freezing in a geometrically frustrated spin model without disorder: spontaneous generation of two time-scales

Details Heterogeneous freezing in a geometrically frustrated spin model without disorder: spontaneous generation of two time-scales Heterogeneous freezing in a geometrically frustrated spin model without disorder: spontaneous generation of two time-scales

2012-03-20

arxiv.org/abs/1203.4398v1

Physics

Condensed Matter

Strongly Correlated Electrons

17 pages, 14 fig

Scientific paper

By considering the constrained motion of classical spins in a geometrically frustrated magnet, we find a dynamical freezing temperature below which the system gets trapped in metastable states with a "frozen" moment and dynamical heterogeneities. The residual collective degrees of freedom are strongly correlated, and by spontaneously forming aggregates, they are unable to reorganize the system. The phase space is then fragmented in a macroscopic number of disconnected sectors (broken ergodicity), resulting in self-induced disorder and "thermodynamic" anomalies, measured by the loss of a finite configurational entropy. We discuss these results in the view of experimental results on the kagome compounds, SrCr(9p)Ga(12-9p)O19, (H30)Fe3(SO4)2(OH)6, Cu3V2O7(OH)2.2H2O and Cu3BaV2O8(OH)2.

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