Nuclear-spin-driven resonant tunnelling of magnetisation in Mn12 acetate

Europhysics Letters

Volumn 47, Issue 2, 1999, Pages 254-259

  Wernsdorfer, W ^a   Sessoli, R ^b   Gatteschi, D ^b  

^a CNRS   (France)

^b UNIVERSITY OF FLORENCE   (Italy)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0033546469     PISSN: 02955075     EISSN: None     Source Type: Journal    
DOI: 10.1209/epl/i1999-00380-5     Document Type: Article

References (35)

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19. 12ac(2) is dispersed in a diluted way over the whole crystal and not forming domains as suggested in ref. (TAKEDA K., AWAGA K. and INABE T., Phys. Rev. B., 57 (1998) R11062). The SQUID array magnetometer allowed also to evidence other fast relaxing species mainly located at the surface of the crystal with no particular orientation of the easy axis.
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25. 12ac(2) is saturated [9]; iii) one can also quench the sample from 5 K to 40 mK in a small field of few 10 2 T. When the quench is fast (few seconds), the sample's magnetisation does not have time to relax, either by thermal or quantum transitions. This procedure yields a frozen thermal equilibrium distribution.
26. dig but also to shifting other molecules away from resonance due to the dipolar coupling.
27. dig but also to shifting other molecules away from resonance due to the dipolar coupling.
28. W. WERNSDORFER, Ph.D. thesis Joseph Fourier University, Grenoble (1996).
29. For these measurements, we used an array of micro-SQUID [15], with a very high sensitivity. We could investigate singles crystals 10 to 100 μm in size. The magnetometer is working in the temperature range between 35 mK and 6 K. Field sweeping rates can be as high as 1 T/s with a maximum field of 1.4 T. The time resolution is about 1 ms allowing short-time measurements.
30. α with 0.3 < α < 0.5. This is irrelevant to the discussion of the letter because it hardly affects the hole linewidths which is the main point of this letter.
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35. This reasoning supposes that the inhomogeneous hyperfine broadening of about 12 m T is temperature independent in the region between 0.04 and 4 K.