Neutron scattering study of the field-induced soliton lattice in CuGeO$_3$

Details Neutron scattering study of the field-induced soliton lattice in CuGeO$_3$ Neutron scattering study of the field-induced soliton lattice in CuGeO$_3$

1999-12-14

arxiv.org/abs/cond-mat/9912251v1

Physics

Condensed Matter

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.84.4469

CuGeO$_3$ undergoes a transition from a spin-Peierls phase to an incommensurate phase at a critical field of $H_c\approx 12.5$ T. In the high-field phase a lattice of solitons forms, with both structural and magnetic components, and these have been studied using neutron scattering techniques. Our results provide direct evidence for a long-ranged magnetic soliton structure which has both staggered and uniform magnetizations, and with amplitudes that are broadly in accord with theoretical estimates. The magnetic soliton width, $\Gamma$, and the field dependence of the incommensurability, $\delta k_{sp}$, are found to agree well with theoretical predictions.

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