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The tunnel splitting in biaxial antiferromagnetic particles is studied with amagnetic field applied along the hard anisotropy axis. We observe theoscillation of tunnel splitting as a function of the magnetic field due to thequantum phase interference of two tunneling paths of opposite windings. Theoscillation is similar to the recent experimental result with Fe}$_8$\textrm{\molecular clusters.}Comment: 8 pages, 2 postscript figures, to appear in J. Phys.: Condes. Matte

Macroscopic quantum phase interference in antiferromagnetic particles