Europhys. Lett.
Volume 66, Number 6, June 2004
Page(s) 861 - 867
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 01 June 2004
Europhys. Lett., 66 (6) , pp. 861-867 (2004)
DOI: 10.1209/epl/i2004-10033-9

Resonant photon absorption in the low-spin molecule $\chem{V_{15}}$

W. Wernsdorfer1, A. Müller2, D. Mailly3 and B. Barbara1

1  Laboratoire Louis Néel, associé à l'UJF, CNRS BP 166, 38042 Grenoble Cedex 9, France
2  Facultät für Chemie, Universitat Bielefeld - D-3300501 Bielefeld, Germany
3  Laboratoire de Photonique et de Nanostructures, CNRS - 91460 Marcoussis, France

(Received 4 February 2004; accepted in final form 15 April 2004)

Resonant photon absorption in the GHz range was observed via low-temperature micro-SQUID magnetization measurements of the spin ground state S=1/2 of the molecular complex $\chem{V_{15}}$. A simple single-molecule interpretation is proposed. The line width essentially results from intra-molecular hyperfine interaction. The results point out that observing Rabi oscillations in molecular nanomagnets requires well-isolated low-spin systems and high radiation power.

75.45.+j - Macroscopic quantum phenomena in magnetic systems.
75.50.Xx - Molecular magnets.
75.60.Ej - Magnetization curves, hysteresis, Barkhausen and related effects.

© EDP Sciences 2004