Volume 108, Number 4, November 2014
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||19 November 2014|
Zero-field quantum tunneling relaxation of the molecular spin in Fe8 observed by 57Fe Mössbauer spectrometry
1 Grup de Magnetisme, Departament de Física Fonamental, Universitat de Barcelona - Barcelona, Spain
2 Institut de Ciència de Materials de Barcelona (CSIC) - Campus UAB, 08193 Bellaterra, Spain
3 Institut des Molécules et Matériaux du Mans, IMMM UMR CNRS 6283 Université du Maine 72085 Le Mans, France
Received: 4 September 2014
Accepted: 30 October 2014
57Fe Mössbauer spectrometry has been performed on oriented crystalline 57Fe enriched samples of Fe8 at 12 K under different applied magnetic fields. Fe8 has an S = 10 ground state and exhibits magnetic anisotropy with a barrier height of about 27 K. Under longitudinal magnetic fields, the energies of the spin levels coincide at steps of about 2.25 kOe, where tunneling relaxation occurs. We present here an experiment specially designed to observe quantum tunneling of molecular spin at zero field through Mössbauer. We report observation of quantum tunneling at temperatures of 12 K.
PACS: 75.50.Xx – Molecular magnets / 75.45.+j – Macroscopic quantum phenomena in magnetic systems / 76.80.+y – Mössbauer effect; other γ-ray spectroscopy
© EPLA, 2014
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