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. (c) 2005 Elsevier Ltd. All rights reserved.
Chiral and helical phase transition in quasi-1D molecular magnets / CINTI F.; AFFRONTE A.; LASCIALFARI A.; BARUCCI M.; OLIVIERI E.; PASCA E.; A. RETTORI; RISEGARI L.; VENTURA G.; PINI M.G.; CUCCOLI A.; ROSCILDE T.; CANESCHI A.; GATTESCHI D.; ROVAI D.. - In: POLYHEDRON. - ISSN 0277-5387. - STAMPA. - 24:(2005), pp. 2568-2572.
Chiral and helical phase transition in quasi-1D molecular magnets
CINTI, FABIO;RETTORI, ANGELO;VENTURA, GUGLIELMO;CUCCOLI, ALESSANDRO;CANESCHI, ANDREA;GATTESCHI, DANTE;ROVAI, DONELLA
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. (c) 2005 Elsevier Ltd. All rights reserved.File | Dimensione | Formato | |
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