Quantum Coherence Oscillations in Antiferromagnetic Chains

Details Quantum Coherence Oscillations in Antiferromagnetic Chains Quantum Coherence Oscillations in Antiferromagnetic Chains

1998-08-22

arxiv.org/abs/quant-ph/9808041v1

Phys.Rev.B59:6013,1999

Physics

Quantum Physics

10 pages, Latex, two postscript figures; submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.59.6013

Macroscopic quantum coherence oscillations in mesoscopic antiferromagnets may appear when the anisotropy potential creates a barrier between the antiferromagnetic states with opposite orientations of the Neel vector. This phenomenon is studied for the physical situation of the nuclear spin system of eight Xe atoms arranged on a magnetic surface along a chain. The oscillation period is calculated as a function of the chain constant. The environmental decoherence effects at finite temperature are accounted assuming a dipole coupling between the spin chain and the fluctuating magnetic field of the surface. The numerical calculations indicate that the oscillations are damped by a rate $\sim (N-1)/ \tau$, where $N$ is the number of spins and $\tau$ is the relaxation time of a single spin.

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