Spectroscopic evidence is given for the recurrent "domain phase" with oppositely magnetized regions in diamagnetic beryllium. A periodic splitting of the precession frequency of implanted muons in a Be single crystal was observed as the strength of the applied field H k ͗0001͘ varied near H 0 2.74 T. On sweeping H downwards, the doublet emerges and persists within more than one third of each de Haasvan Alphen cycle, the positions of the lines fixed, with the lower frequency (diamagnetic) component gaining and the higher (paramagnetic) one losing intensity. The line splitting gives DB ഠ 29 G for the induction difference in domains at T 0.8 K.
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