Quantum phase interference and Néel-vector tunneling in antiferromagnetic molecular wheels.
The antiferromagnetic molecular wheel Fe18 of 18 exchange-coupled Fe;{III} ions has been studied by magnetic torque, magnetization, and inelastic neutron scattering. The combined data show that the low-temperature magnetism of Fe18 is very accurately described by the Néel-vector tunneling (NVT) scenario, as unfolded by semiclassical theory. In addition, the magnetic torque as a function of applied field exhibits oscillations that reflect the oscillations in the NVT splitting with field due to quantum phase interference.
Waldmann
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O
Physikalisches Institut, Universität Freiburg, D-79104 Freiburg, Germany. oliver.waldmann@physik.uni-freiburg.de
Stamatatos
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TC
Christou
G
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Güdel
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HU
Sheikin
I
I
Mutka
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