Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2001-09-13
J. Appl. Phys. 91, 8384 (2002)
Physics
Condensed Matter
Disordered Systems and Neural Networks
submitted for the proceedings of the 46th MMM conference (Seattle, 2001)
Scientific paper
10.1063/1.1450823
The model 2d kagome system (H3O)Fe3(SO4)2(OH)6 and the 3d pyrochlore Y2Mo2O7 are two well characterized examples of low-disordered frustrated antiferromagnets which rather then condensing into spin liquid have been found to undergo a freezing transition with spin glass-like properties. We explore more deeply the comparison of their properties with those of spin glasses, by the study of characteristic rejuvenation and memory effects in the non-stationary susceptibility. While the pyrochlore shows clear evidence for these non-trivial effects, implying temperature selective aging, that is characteristic of a wide hierarchical distribution of equilibration processes, the kagome system does n not show clearly these effects. Rather, it seems to evolve towards the same final state independently of temperature.
Dupuis Véronique
Greedan John E.
Hammann Jacques
Vincent Edith
Wills Andrew S.
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