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The results of a detailed histogram Monte-Carlo study of critical-fluctuationeffects on the magnetic-field temperature phase diagram associated with thehexagonal Heisenberg antiferromagnet with weak axial anisotropy are reported.The multiphase point where three lines of continuous transitions merge at thespin-flop boundary exhibits a structure consistent with scaling theory butwithout the usual umbilicus as found in the case of a bicritical point.Comment: 7 pages (RevTex 3.0), 1 figure available upon request, CRPS-93-1

Histogram Monte Carlo study of multicritical behavior in the hexagonal easy-axis Heisenberg antiferromagnet