X-ray scattering study of the incommensurate phase in Mg-doped CuGeO3
Author(s)
Christianson, Rebecca J Wang, Y. J. LaMarra, S.C. Birgeneau, R. J. Kiryukhin, V. Masuda, T. Tsukada, I. Uchinokura, K. Keimer, B.
Description
We present results of a systematic x-ray scattering study of the effects of Mg doping on the high-fieldincommensurate phase of CuGeO3. Lorentzian-squared line shapes, the changing of the first-order transition tosecond order, and the destruction of long-range order with infinitesimal doping are observed, consistent withrandom-field effects in a three-dimensional XY system. Values for the soliton width in pure and lightly dopedCuGeO3 are deduced. We find that even a very small doping has a drastic effect on the shape of the latticemodulation.