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Neutron Scattering Study of Temperature-Concentration Phase Diagram of (Cu1-xMgx)GeO3 | | H. Nakao
; M. Nishi
; Y. Fujii
; T. Masuda
; I. Tsukada
; K. Uchinokura
; K. Hirota
; G. Shirane
; | | Date: |
23 Nov 1998 | | Subject: | Materials Science | cond-mat.mtrl-sci | | Abstract: | 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. | | Source: | arXiv, cond-mat/9811324 | | Services: | Forum | Review | PDF | Favorites | |
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