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Radio-frequency spectroscopy of the low-energy spectrum of the magnetic molecule Cr12Cu2

Catalin Martin, Larry Engelhardt, Michael L. Baker, Grigore A. Timco, Floriana Tuna, Richard E. P. Winpenny, Philip L. W. Tregenna-Piggott, Marshall Luban, and Ruslan Prozorov
Phys. Rev. B 80, 100407(R) – Published 28 September 2009

Abstract

We present tunnel diode oscillator (TDO) measurements of dynamic magnetic susceptibility, inelastic neutron-scattering (INS) measurements, and theoretical predictions based on quantum Monte Carlo (QMC) calculations for a magnetic molecule system, Cr12Cu2. The TDO measurements show not only ground-state level crossings (as can also be observed in low-temperature dc magnetization measurements) but also clear evidence of crossings between certain excited energy levels. These TDO results are in excellent agreement with our theoretical predictions for a Heisenberg Hamiltonian and are further confirmed by our INS measurements. Our present findings demonstrate that the TDO technique is a valuable magnetic spectroscopic tool for studying magnetic molecules, and that the QMC method is a valuable tool for predicting properties of computationally demanding systems such as Cr12Cu2.

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  • Received 5 August 2009

DOI:https://doi.org/10.1103/PhysRevB.80.100407

©2009 American Physical Society

Authors & Affiliations

Catalin Martin1, Larry Engelhardt2, Michael L. Baker3,4, Grigore A. Timco3, Floriana Tuna3, Richard E. P. Winpenny3, Philip L. W. Tregenna-Piggott5, Marshall Luban1, and Ruslan Prozorov1,*

  • 1Department of Physics and Astronomy and Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA
  • 2Department of Physics and Astronomy, Francis Marion University, Florence, South Carolina 29501, USA
  • 3School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
  • 4Institut Laue-Langevin, BP 156, 6 rue Jules Horowitz, 38042 Grenoble Cedex 9, France
  • 5Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3000 Bern 9, Switzerland

  • *Corresponding author; prozorov@ameslab.gov

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Issue

Vol. 80, Iss. 10 — 1 September 2009

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