Spin dynamics at the level crossing in the molecular antiferromagnetic ring [Cr8F8Piv16] from proton NMR

E. Micotti, A. Lascialfari, F. Borsa, M. H. Julien, C. Berthier, M. Horvatić, J. Van Slageren, D. Gatteschi

Research output: Contribution to journalArticle

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Abstract

The H1 NMR average effective spin-lattice relaxation rate 1 T1 has been measured as a function of magnetic field (4.5-15.6T) at T=1 and 0.3K, and as a function of temperature (0.07-1K) around the first crossing field Hc1=7.43T, in the molecular antiferromagnetic ring [Cr8F8Piv16] (Cr8). T1-1(H) shows a single peak centered at Hc1 and a double peak for HHc2. The field dependence of 1 T1 away from the level crossing can be explained by a nuclear relaxation mechanism due to quasielastic scattering in the S=1 excited state thus yielding the energy gap between S=0 and S=1, MS=-1 states. An additional contribution to T1-1 can be detected near Hc1, due to inelastic scattering. Information about the H and T dependence of the width of the molecular magnetic levels is obtained from the fit of the T1-1 data.

Original languageEnglish
Article number020405
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number2
DOIs
Publication statusPublished - Jul 1 2005

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Spin dynamics
Inelastic scattering
Spin-lattice relaxation
spin dynamics
Excited states
Protons
Energy gap
Nuclear magnetic resonance
Scattering
Magnetic fields
nuclear relaxation
nuclear magnetic resonance
protons
rings
spin-lattice relaxation
inelastic scattering
Temperature
scattering
magnetic fields
excitation

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Spin dynamics at the level crossing in the molecular antiferromagnetic ring [Cr8F8Piv16] from proton NMR. / Micotti, E.; Lascialfari, A.; Borsa, F.; Julien, M. H.; Berthier, C.; Horvatić, M.; Van Slageren, J.; Gatteschi, D.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 72, No. 2, 020405, 01.07.2005.

Research output: Contribution to journalArticle

Micotti, E. ; Lascialfari, A. ; Borsa, F. ; Julien, M. H. ; Berthier, C. ; Horvatić, M. ; Van Slageren, J. ; Gatteschi, D. / Spin dynamics at the level crossing in the molecular antiferromagnetic ring [Cr8F8Piv16] from proton NMR. In: Physical Review B - Condensed Matter and Materials Physics. 2005 ; Vol. 72, No. 2.
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AU - Julien, M. H.

AU - Berthier, C.

AU - Horvatić, M.

AU - Van Slageren, J.

AU - Gatteschi, D.

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