Observation of Diamagnetic Domains in Beryllium by Muon Spin Rotation Spectroscopy

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∥〈0001〉 varied near H₀0ex0ex=0ex0ex2.74T. On sweeping H downwards, the doublet emerges and persists within more than one third of each de Haas--van 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 ΔB≈29G for the induction difference in domains at T0ex0ex=0ex0ex0.8K.