OBSERVATION OF DIAMAGNETIC DOMAINS IN BERYLLIUM

We have observed diamagnetic domains (Candon domains) in a beryllium s ingle crystal in magnetic fields H less than or equal to 3 T (H parall el to[0001]) at liquid-helium temperatures. The formation of the domai n structure was determined according to magnetic-breakdown quantum osc illations of the resistance thermoelectric power as well as according to the splitting of the resonance peak of the free spin precession fre quency of muons (mu SR). The alternation of a uniform state (with one mu SR peak) and a state with domain structure (with two peaks) is cons istent as regards the periodicity with the de Haas-van Alphen effect, the period is Delta H congruent to 78 Oe, and the range of existence o f domains and the difference in their magnetizations are Delta B=4 pi Delta M=B-2-B-1 congruent to 30 Oe. (C) 1998 American Institute of Phy sics. [S1063-7834(98)02703-8].