Probing spin frustration in high-symmetry magnetic nanomolecules by inelastic neutron scattering

V. O. Garlea,1,* S. E. Nagler,2 J. L. Zarestky,1 C. Stassis,1 D. Vaknin,1 P. Kögerler,1 D. F. McMorrow,3,4 C. Niedermayer,5 D. A. Tennant,6 B. Lake,7,1 Y. Qiu,8 M. Exler,9 J. Schnack,9 and M. Luban1 1Ames Laboratory, Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA 2Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA 3Risø National Laboratory, DK-4000, Roskilde, Denmark 4Department of Physics and Astronomy, University College London, London, United Kingdom 5Laboratory for Neutron Scattering ETHZ and PSI, CH-5232 Villigen PSI, Switzerland 6School of Physics and Astronomy, University of St Andrews, St. Andrews, FIFE KY16 9SS, Scotland, United Kingdom 7Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom 8NIST Center for Neutron Research, Gaithersburg, Maryland 20899, USA and Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA 9Universität Osnabrück, Fachbereich Physik, D-49069 Osnabrück, Germany Received 25 October 2005; revised manuscript received 14 December 2005; published 23 January 2006