We review recent experimental data obtained with quasi-one-dimensional (1D) molecular magnets Gd(hfaC)(3)NITR. For Gd(hfac)(3)NITiPr the results can be coherently explained only in terms of the Villain´s conjecture: a chiral order at intermediate temperatures and helical order at low temperatures. In the case of weakly frustrated molecular magnetic chain compounds Gd(hfac)(3)-NITPh, new specific heat measurements show the presence of a phase transition to the three-dimensional (3D) helical order, observed at T similar to 0.63 K. In the temperature range 25-250 mK the experimental specific heat data are reproduced very well by a simple spin wave theory.
Chiral and helical phase transitions in quasi-1D molecular magnets / Cinti, F; Affronte, Marco; Lascialfari, A; Barucci, M; Olivieri, E; Pasca, E; Rettori, A; Risegari, L; Ventura, G; Pini, Mg; Cuccoli, A; Roscilde, T; Caneschi, A; Gatteschi, D; Rovai, D.. - In: POLYHEDRON. - ISSN 0277-5387. - STAMPA. - 24:16-17(2005), pp. 2568-2572. [10.1016/j.poly.2005.03.124]
Chiral and helical phase transitions in quasi-1D molecular magnets
AFFRONTE, Marco;
2005
Abstract
We review recent experimental data obtained with quasi-one-dimensional (1D) molecular magnets Gd(hfaC)(3)NITR. For Gd(hfac)(3)NITiPr the results can be coherently explained only in terms of the Villain´s conjecture: a chiral order at intermediate temperatures and helical order at low temperatures. In the case of weakly frustrated molecular magnetic chain compounds Gd(hfac)(3)-NITPh, new specific heat measurements show the presence of a phase transition to the three-dimensional (3D) helical order, observed at T similar to 0.63 K. In the temperature range 25-250 mK the experimental specific heat data are reproduced very well by a simple spin wave theory.
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