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

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

1998-11-23

arxiv.org/abs/cond-mat/9811324v4

Physics

Condensed Matter

Materials Science

9 pages, 9 figures

Scientific paper

10.1143/JPSJ.68.3662

In doped CuGeO3 systems, such as (Cu1-xZnx)GeO3 and Cu(Ge1-xSix)O3, the spin-Peierls (SP) ordering (Txc. They thus concluded that there is a compositional phase boundary between two distinct magnetic phases. To clarify the nature of two phases, we performed neutron-scattering measurements on (Cu1-xMgx)GeO3 single crystals with various x. Analysis of the data at fixed temperature points as a function of doping concentration has revealed sudden changes of order parameters at the critical concentration xc=0.027 +- 0.001. At finite temperatures below TN, the drastic increase of the AF moment takes place at xc. The spin-Peierls order parameter delta associated with lattice dimerization shows a precipitous decrease at all temperature below Tsp. However, it goes to zero above xc only at the low temperature limit.

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