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In doped CuGeO3 systems, such as (Cu1-xZnx)GeO3 and Cu(Ge1-xSix)O3, thespin-Peierls (SP) ordering (T<Tsp) coexists with the antiferromagnetic (AF)phase (T<TN<Tsp). Tsp decreases while TN increases with increasing x in lowdoping region. For higher x, however, the SP state disappears and only the AFstate remains. These features are common for all the doped CuGeO3 systems sofar studied, indicating the existence of universal T-x phase diagram. Recently,Masuda et al. carried out comprehensive magnetic susceptibility (chi)measurements of (Cu1-xMgx)GeO3, in which doping concentration can be controlledsignificantly better than the Zn doped systems. They found that TN suddenlyjumps from 3.43 to 3.98K at the critical concentration xc sim 0.023 and that adrop in chi corresponding to the SP ordering also disappears at x>xc. They thusconcluded that there is a compositional phase boundary between two distinctmagnetic phases. To clarify the nature of two phases, we performedneutron-scattering measurements on (Cu1-xMgx)GeO3 single crystals with variousx. Analysis of the data at fixed temperature points as a function of dopingconcentration has revealed sudden changes of order parameters at the criticalconcentration xc=0.027 +- 0.001. At finite temperatures below TN, the drasticincrease of the AF moment takes place at xc. The spin-Peierls order parameterdelta associated with lattice dimerization shows a precipitous decrease at alltemperature below Tsp. However, it goes to zero above xc only at the lowtemperature limit.Comment: 9 pages, 9 figure

journal of the physical society of japan

Neutron Scattering Study of Temperature-Concentration Phase Diagram of (Cu1-xMgx)GeO3