Asymmetric Berry-Phase Interference Patterns in a Single-Molecule Magnet

H. M. Quddusi, J. Liu, S. Singh, K. J. Heroux, E. del Barco, S. Hill, and D. N. Hendrickson
Phys. Rev. Lett. 106, 227201 – Published 31 May 2011
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Abstract

A Mn4 single-molecule magnet displays asymmetric Berry-phase interference patterns in the transverse-field (HT) dependence of the magnetization tunneling probability when a longitudinal field (HL) is present, contrary to symmetric patterns observed for HL=0. Reversal of HL results in a reflection of the transverse-field asymmetry about HT=0, as expected on the basis of the time-reversal invariance of the spin-orbit Hamiltonian which is responsible for the tunneling oscillations. A fascinating motion of Berry-phase minima within the transverse-field magnitude-direction phase space results from a competition between noncollinear magnetoanisotropy tensors at the two distinct Mn sites.

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  • Received 24 November 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.227201

© 2011 American Physical Society

Authors & Affiliations

H. M. Quddusi1, J. Liu2, S. Singh1, K. J. Heroux4, E. del Barco1, S. Hill3, and D. N. Hendrickson4

  • 1Department of Physics, University of Central Florida, Orlando, Florida 32816, USA
  • 2Department of Physics, University of Florida, Gainesville, Florida 32611, USA
  • 3National High Magnetic Field Laboratory and Department of Physics, Florida State University, Tallahassee, Florida 32310, USA
  • 4Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, California 92093, USA

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Vol. 106, Iss. 22 — 3 June 2011

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