We report 1H nuclear spin-lattice relaxation rates T 1-1 in the magnetic cluster {V12}. While no critical enhancement in 1H T1-1 was found at T∼|J| contrary to other antiferromagnetic molecules, the T1ρ was observed to exhibit a peak at 19 K. The different behavior is discussed in terms of critical effects in classical spins (s = 5/2) vs. quantum spins (s = 1/2). From the exponential drop of the proton T1-1 at low T, we obtained the gap values between the ST = 0 ground state to the excited states: δ1 ≅ 17 K, δ2 ≅ 35 K, and δ3 ≅ 52K.
1H NMR study of dodecanuclear polyoxovanadate cluster {V12} / B.J. Suh, D. Procissi, P. Kögerler, E. Micotti, A. Lascialfari, F. Borsa. - In: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - ISSN 0304-8853. - 272-276:Suppl. 1(2004), pp. E759-E761.
1H NMR study of dodecanuclear polyoxovanadate cluster {V12}
A. LascialfariPenultimo
;
2004
Abstract
We report 1H nuclear spin-lattice relaxation rates T 1-1 in the magnetic cluster {V12}. While no critical enhancement in 1H T1-1 was found at T∼|J| contrary to other antiferromagnetic molecules, the T1ρ was observed to exhibit a peak at 19 K. The different behavior is discussed in terms of critical effects in classical spins (s = 5/2) vs. quantum spins (s = 1/2). From the exponential drop of the proton T1-1 at low T, we obtained the gap values between the ST = 0 ground state to the excited states: δ1 ≅ 17 K, δ2 ≅ 35 K, and δ3 ≅ 52K.
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