Tuning interactions in the spin-ice materials Dy$_2$Ge$_{2-x}$Si$_x$O$_7$ by silicon substitution
Abstract
We report that the lattice constant of DyGeSiO () can be systematically reduced by substituting the non-magnetic germanium ion in the cubic pyrochlore oxide with silicon. A multi-anvil high-pressure synthesis was performed up to 16 GPa and 1100 C to obtain polycrystalline samples in a solid-state reaction. Measurements of magnetization, ac susceptibility, and heat capacity reveal the typical signatures of a spin-ice phase. From the temperature shift of the peaks, observed in the temperature-dependent heat capacity, we deduce an increase of the strength of the exchange interaction. In conclusion, the reduced lattice constant leads to a changed ratio of the competing exchange and dipolar interaction. This puts the new spin-ice compounds closer towards the phase boundary of short-range spin-ice arrangement and antiferromagnetic long-range order consistent with an observed reduction of the monopole energy scale.
Keywords
Cite
@article{arxiv.1809.01480,
title = {Tuning interactions in the spin-ice materials Dy$_2$Ge$_{2-x}$Si$_x$O$_7$ by silicon substitution},
author = {T. Stöter and M. Antlauf and L. Opherden and T. Gottschall and J. Hornung and J. Gronemann and T. Herrmannsdörfer and S. Granovsky and M. Schwarz and M. Doerr and H. -H. Klauss and E. Kroke and J. Wosnitza},
journal= {arXiv preprint arXiv:1809.01480},
year = {2019}
}
Comments
6 pages, 6 figures