NMR study of the high magnetic field incommensurate phase of the CuGeO3 spin-Peierls system

Soliton lattices in the incommensurate spin-Peierls phase: Local distortions and magnetizations

“…The motivation for the equations ( 17) is twofold. First, such fits are used to describe the experimental data [19][20][21]. Second, the continuum approaches provide results of the above kind [2,3,7,6,12,22].…”

“…This would imply that at most L discrete local magnetization values m i occur. The experimental resolution, however, is sufficiently high to exclude this scenario since not a number of isolated peaks but a continuous distribution is observed in the NMR response [20,21].…”

“…They permit to address the second main point, namely the discrepancy between the soliton widths as measured by X-ray and by NMR. In section IV a detailed comparison to recent experimental data [20,21] will be presented. The concluding section contains a discussion of the open questions, namely the role of interchain couplings, and a summary of our results.…”

“…On the other side, Fagot-Revurat et al [19] were able to measure the distribution of local magnetizations in CuGeO 3 in a beautiful NMR experiment. In a refined version it was now possible to deduce from such results the shape and the amplitude of the magnetic part of a soliton [20,21]. Three discrepancies to the conventional theories became apparent.…”

Spin fluctuations and frustrated magnetism in multiferroicFeVO4

“…2(b), is approximately 8 MHz, which is considerably less than f H and therefore indicates that the hyperfine field on the V sites is almost perpendicular to the applied external field. The NMR spectrum in incommensurate magnetically ordered states usually has a characteristic "doublehorn" feature, [16][17][18] but this is obtained when the applied field is not perpendicular to the internal field. Thus in our present field configuration we are not able to distinguish between an incommensurate spin structure and other forms of modulation that also give rise to a distribution of hyperfine fields, and can state only that our broad line shapes are consistent with the known incommensurate order.…”