Abstract
We have measured muon spin relaxation (μSR) in (Cu 1− x Mg x )GeO 3, a spin-Peierls compound disturbed by the Mg ( S=0) doping of the Cu ( S= 1 2 ) spin chain. Static magnetic order was observed in the zero-field μSR measurements below the Néel temperatures determined by the susceptibility measurements. The zero-field muon relaxation exhibits a characteristic line shape in disturbed spin-Peierls compounds; muon spin precession together with exponential static relaxation. The amplitude of the precession, which is a measure of spacial homogeneity of the ordered moment size, takes the maximum at Mg concentration x∼0.03, which is just above the phase boundary in the temperature–Mg concentration ( T– x) phase diagram.
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