Quantum oscillations of the total spin in a heterometallic antiferromagnetic ring: Evidence from neutron spectroscopy

S. Carretta; P. Santini; G. Amoretti; T. Guidi; J. R D Copley; Y. Qiu; R. Caciuffo; G. Timco; R. E P Winpenny

doi:10.1103/PhysRevLett.98.167401

Quantum oscillations of the total spin in a heterometallic antiferromagnetic ring: Evidence from neutron spectroscopy

S. Carretta, P. Santini, G. Amoretti, T. Guidi, J. R D Copley, Y. Qiu, R. Caciuffo, G. Timco, R. E P Winpenny

Research output: Contribution to journal › Article › peer-review

Abstract

Using inelastic neutron scattering and applied fields up to 11.4T, we have studied the spin dynamics of the Cr7Ni antiferromagnetic ring in the energy window 0.05-1.6meV. We demonstrate that the external magnetic field induces an avoided crossing (anticrossing) between energy levels with different total-spin quantum numbers. This corresponds to quantum oscillations of the total spin of each molecule. The inelastic character of the observed excitation and the field dependence of its linewidth indicate that molecular spins oscillate coherently for a significant number of cycles. Precise signatures of the anticrossing are also found at higher energy, where measured and calculated spectra match very well. © 2007 The American Physical Society.

Original language	English
Article number	167401
Journal	Physical Review Letters
Volume	98
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevLett.98.167401
Publication status	Published - 16 Apr 2007

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10.1103/PhysRevLett.98.167401

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title = "Quantum oscillations of the total spin in a heterometallic antiferromagnetic ring: Evidence from neutron spectroscopy",

abstract = "Using inelastic neutron scattering and applied fields up to 11.4T, we have studied the spin dynamics of the Cr7Ni antiferromagnetic ring in the energy window 0.05-1.6meV. We demonstrate that the external magnetic field induces an avoided crossing (anticrossing) between energy levels with different total-spin quantum numbers. This corresponds to quantum oscillations of the total spin of each molecule. The inelastic character of the observed excitation and the field dependence of its linewidth indicate that molecular spins oscillate coherently for a significant number of cycles. Precise signatures of the anticrossing are also found at higher energy, where measured and calculated spectra match very well. {\textcopyright} 2007 The American Physical Society.",

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T1 - Quantum oscillations of the total spin in a heterometallic antiferromagnetic ring: Evidence from neutron spectroscopy

AU - Carretta, S.

AU - Santini, P.

AU - Amoretti, G.

AU - Guidi, T.

AU - Copley, J. R D

AU - Qiu, Y.

AU - Caciuffo, R.

AU - Timco, G.

AU - Winpenny, R. E P

PY - 2007/4/16

Y1 - 2007/4/16

N2 - Using inelastic neutron scattering and applied fields up to 11.4T, we have studied the spin dynamics of the Cr7Ni antiferromagnetic ring in the energy window 0.05-1.6meV. We demonstrate that the external magnetic field induces an avoided crossing (anticrossing) between energy levels with different total-spin quantum numbers. This corresponds to quantum oscillations of the total spin of each molecule. The inelastic character of the observed excitation and the field dependence of its linewidth indicate that molecular spins oscillate coherently for a significant number of cycles. Precise signatures of the anticrossing are also found at higher energy, where measured and calculated spectra match very well. © 2007 The American Physical Society.

AB - Using inelastic neutron scattering and applied fields up to 11.4T, we have studied the spin dynamics of the Cr7Ni antiferromagnetic ring in the energy window 0.05-1.6meV. We demonstrate that the external magnetic field induces an avoided crossing (anticrossing) between energy levels with different total-spin quantum numbers. This corresponds to quantum oscillations of the total spin of each molecule. The inelastic character of the observed excitation and the field dependence of its linewidth indicate that molecular spins oscillate coherently for a significant number of cycles. Precise signatures of the anticrossing are also found at higher energy, where measured and calculated spectra match very well. © 2007 The American Physical Society.

U2 - 10.1103/PhysRevLett.98.167401

DO - 10.1103/PhysRevLett.98.167401

M3 - Article

SN - 0031-9007

VL - 98

JO - Physical Review Letters

JF - Physical Review Letters

IS - 16

M1 - 167401

ER -

Quantum oscillations of the total spin in a heterometallic antiferromagnetic ring: Evidence from neutron spectroscopy

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