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Very low-frequency excitations in frustrated two-dimensional $S=1/2$ Heisenberg antiferromagnets

Autor: Carretta, P., Melzi, R., Papinutto, N., Millet, P.

muSR and 7Li NMR relaxation measurements in frustrated two-dimensional S=1/2 Heisenberg antiferromagnets on a square lattice are presented. It is found that both in Li2VOSiO4 and Li2VOGeO4, spin dynamics at frequencies well below the Heisenberg excha

Externí odkaz: http://arxiv.org/abs/cond-mat/0110398

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Magnetic and thermodynamic properties of Li(2)VOSiO(4): a two-dimensional S=1/2 frustrated antiferromagnet on a square lattice

Autor: Melzi, R., Aldrovandi, S., Tedoldi, F., Carretta, P., Millet, P., Mila, F.

NMR, muSR, magnetization and specific heat measurements in Li(2)VOSiO(4) powders and single crystals are reported. Specific heat and magnetization measurements evidence that Li(2)VOSiO(4) is a frustrated two-dimensional S=1/2 Heisenberg antiferromagn

Externí odkaz: http://arxiv.org/abs/cond-mat/0101066

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Li$_2$VO(Si,Ge)O$_4$, a prototype of a two-dimensional frustrated quantum Heisenberg antiferromagnet

Autor: Melzi, R., Carretta, P., Lascialfari, A., Mambrini, M., Troyer, M., Millet, P., Mila, F.

Publikováno v: Phys. Rev. Lett. 85, 1318 (2000)

NMR and magnetization measurements in Li$_2$VOSiO$_4$ and Li$_2$VOGeO$_4$ are reported. The analysis of the susceptibility shows that both compounds are two-dimensional $S=1/2$ Heisenberg antiferromagnets on a square lattice with a sizeable frustrati

Externí odkaz: http://arxiv.org/abs/cond-mat/0005273

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On the estimate of the spin-gap in quasi-1D Heisenberg antiferromagnets from nuclear spin-lattice relaxation

Autor: Melzi, R., Carretta, P.

We present a careful analysis of the temperature dependence of the nuclear spin-lattice relaxation rate $1/T_1$ in gapped quasi-1D Heisenberg antiferromagnets. It is found that in order to estimate the value of the gap correctly from $1/T_1$ the pecu

Externí odkaz: http://arxiv.org/abs/cond-mat/9904074

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