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.
2002
66
6
644081
644087
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]
Affronte, Marco; Lasjaunias, Jc; Wernsdorfer, W.; Sessoli, R.; Gatteschi, D.; Health, S. L.; Fort, A.; Rettori, A.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/451603
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