Physics – Condensed Matter
Scientific paper
1997-10-28
Physics
Condensed Matter
4 pages, 3 figures as separate eps files
Scientific paper
Small ferromagnets and anti-ferromagnets with an easy-plane anisotropy have a ground to first excited state (tunnel) splitting which is quasi-periodic in the magnitude of a field applied perpendicular to a principal anisotropy axis. The associated oscillations in thermodynamic quantities might be used to prove the existence of a coherent ground state even when the tunnel splitting itself cannot be directly detected.
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