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- W2022861656 abstract "We study the ground-state and low-energy properties of classical vector spin models with nearest-neighbor antiferromagnetic interactions on a class of geometrically frustrated lattices, which includes the kagome and pyrochlore lattices. We explore the behavior of these magnets that results from their large ground-state degeneracies, emphasizing universal features and systematic differences between individual models. We investigate the circumstances under which thermal fluctuations select a particular subset of the ground states, and find that this happens only for the models with the smallest ground-state degeneracies. For the pyrochlore magnets, we give an explicit construction of all ground states, and show that they are not separated by internal energy barriers. We study the precessional spin dynamics of the Heisenberg pyrochlore antiferromagnet. There is no freezing transition or selection of preferred states. Instead, the relaxation time at low temperature T is of order $ensuremath{Elzxh}{/k}_{B}T.$ We argue that this behavior can also be expected in some other systems, including the Heisenberg model for the compound ${mathrm{SrCr}}_{8}{mathrm{Ga}}_{4}{mathrm{O}}_{19}.$" @default.
- W2022861656 created "2016-06-24" @default.
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- W2022861656 date "1998-11-01" @default.
- W2022861656 modified "2023-10-16" @default.
- W2022861656 title "Low-temperature properties of classical geometrically frustrated antiferromagnets" @default.
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- W2022861656 doi "https://doi.org/10.1103/physrevb.58.12049" @default.
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