Origin of superhyperfine interactions in the antiferromagnetic ring Cr7Ni

C. Schlegel, J. van Slageren, G. Timco, R. E. P. Winpenny, and M. Dressel
Phys. Rev. B 83, 134407 – Published 8 April 2011

Abstract

W-band pulsed ESR measurements on the antiferromagnetic ring Cr7Ni reveal that the spin-lattice relaxation time is T1=5.3±0.2μs at T=4.0 K, and decreases strongly with increasing temperature. The phase coherence time is determined to be TM=357±10 ns. Pulsed W-band ENDOR measurements quantify the superhyperfine coupling of the electron spin to the proton nuclear spins. Calculating the dipolar contribution of all the protons to the hyperfine splitting, in the point-dipole approximation, gives a good simulation of the experimental data, demonstrating that magnetic dipole interactions between electron and nuclear spins are the origin of the superhyperfine interaction.

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  • Received 7 October 2010

DOI:https://doi.org/10.1103/PhysRevB.83.134407

©2011 American Physical Society

Authors & Affiliations

C. Schlegel1, J. van Slageren1,2,*, G. Timco3, R. E. P. Winpenny3,4, and M. Dressel1

  • 11. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
  • 2School of Chemistry, University Nottingham, Nottingham, NG7 2RD, United Kingdom
  • 3School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
  • 4Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom

  • *Present address: Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany. slageren@ipc.uni-stuttgart.de

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Vol. 83, Iss. 13 — 1 April 2011

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