Magnetic ordering in a high-spin Fe19 magnetic nanomagnet
We report evidence of antiferromagnetic (AF) transition in Fe19metheidi, a molecular nanomagnet with a total spin S = 33/2. The temperature (T) dependence of the specific heat (C) shows a λ anomaly at 1.19 K and at the same temperature an anomaly is also observed in the low-field (B<0.12 T) magnetization M-vs-T curves. Since the dipolar interaction between clusters is estimated to be ∼190 mK, the origin of the AF transition is probably due to superexchange. Analysis of the specific heat at very low temperature reveals an exponential T scaling of C, which we ascribe to the presence of an energy gap in the spin-wave spectra and, below 150 mK, a hyperfine C/R ∼4.2×10-5T-2 term mainly due to the protons closest to iron.
Magnetic ordering in a high-spin Fe19 magnetic nanomagnet / Affronte, Marco; Lasjaunias, Jc; Wernsdorfer, W.; Sessoli, R.; Gatteschi, D.; Health, S. L.; Fort, A.; Rettori, A.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 66:6(2002), pp. 644081-644087. [10.1103/PhysRevB.66.064408]
Magnetic ordering in a high-spin Fe19 magnetic nanomagnet
AFFRONTE, Marco;
2002
Abstract
We report evidence of antiferromagnetic (AF) transition in Fe19metheidi, a molecular nanomagnet with a total spin S = 33/2. The temperature (T) dependence of the specific heat (C) shows a λ anomaly at 1.19 K and at the same temperature an anomaly is also observed in the low-field (B<0.12 T) magnetization M-vs-T curves. Since the dipolar interaction between clusters is estimated to be ∼190 mK, the origin of the AF transition is probably due to superexchange. Analysis of the specific heat at very low temperature reveals an exponential T scaling of C, which we ascribe to the presence of an energy gap in the spin-wave spectra and, below 150 mK, a hyperfine C/R ∼4.2×10-5T-2 term mainly due to the protons closest to iron.Pubblicazioni consigliate
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris