Observation of Diamagnetic Domains in Beryllium by Muon Spin Rotation Spectroscopy

Abstract

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 $\mathbf{H}\ensuremath{\parallel}〈0001〉$ varied near ${H}_{0}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}2.74\mathrm{T}$. 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 $\ensuremath{\Delta}B\ensuremath{\approx}29\mathrm{G}$ for the induction difference in domains at $T\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.8\mathrm{K}$.